Bài tập Tiếng Anh Lớp 8 - Các thì

 PART I: TENSES (CÁC THÌ)
A. LÝ THUYẾT
1. SIMPLE PRESENT (HIỆN TẠI ĐƠN).
a. Với động từ “to be”:
Form: (+) S + are/is/am + O
 (-) S + aren’t/ isn’t/ am not + O
 (?) Are/ is/ am (not) + S + O?
b. Với động từ “to do”:
Form: (+) S + V(s/es) + O ( I, you we, they , Ns + V)
 ( he,she ,it , N + Vs/es)
 (-) S + don’t/ doesn’t + V + O
 (?) Do/ Does (not) + S + V + O?
c. Uses (Cách sử dụng thì hiện tại đơn)
- Dùng để giới thiệu bản thân, lịch trình, sở thích.
- Dùng để diễn tả hành động thường xuyên xảy ra, 1 thói quen hàng ngày, 1 sự thật hiển
nhiên, 1 chân lý, 1 câu châm ngôn.
d. Advs (Trạng ngữ nhận biết)
- Always, usually, often, sometimes, occasionally, ever, never, seldom = rarely, now and
then, not often, hardly ever.
- Every: every day, every week, 
e. Cách chia động từ thêm “S/ES/Y - IES”:
- Hầu hết các động từ đều thêm s.
Eg: ask → asks
hate → hates
- Với các động từ có tận cùng là: -s, -ss, -sh, -ch, -o, -x, -z ta thêm es vào sau động từ.
Eg: go → goes wash → washes
watch → watches kiss → kisses
- Những động từ tận cùng là y, trước đó là một phụ âm thì đổi y → i rồi thêm es.
Eg: study → studies try → tries
copy → copies carry → carries
B. PRACTICE ON TENSES
I. SIMPLE PRESENT (HIỆN TẠI ĐƠN)
Exercise 1: Put the verb in the present simple tense.
1. She (wash) _____________her clothes every Sunday.
2. She (study) _____________English every day.
3. He (want) _____________to become a teacher.
4. She usually (walk) _____________to school.
5. What time _____________Mary usually (get) _____________up every morning?
6. She (not wash) _____________her clothes every weekend.
7. _____________they (be) teachers?
8. It (not be) _____________often cold in summer.
9. Tom usually (walk) _____________to school.
10. He (be) _____________a student.
Exercise 2: Put the verb in the present simple tense.
1. I (be) _____________sixteen years old.
2. They (be) _____________very friendly.
3. Every week she (go) _____________to visit her parents.
4. What time _____________your father usually (get) _____________up?
5. We (not go) _____________to school on Sundays. 6. We (not be) _____________very lazy.
7. The Earth (go) _____________ around the Sun.
8. I (visit) _____________my parents very often.
9. _____________he (go) _____________to school every day?
10. _____________she (come) _____________from Japanese?
Exercise 3: Give the correct tense form of the verbs.
1. They often_____________ (go) to school on foot.
2. She_____________ (go) to the park everyday.
3. Bad students never _____________ (work) hard.
4. It often _____________ (rain) in the summer.
5. He usually _____________ (water) the trees in the morning.
6. She always _____________ (cook) in the morning.
7. I always _____________ (meet) him on the corner of this street.
8. He _____________ (not do) morning exercises regularly.
9. Water _____________ (boil) at 100 degrees centigrade.
10. _____________You ____________ (be) a good student?
Exercise 4: Give the correct tense form of the verbs.
1. They _____________usually _____________ (not go) to school by motorbike.
2. They _____________ (not be) doctors.
3. He often _____________ (get) up late.
4. _____________you often _____________ (watch) TV?
5. I usually _____________ (go) shopping on weekend.
6. Hai often _____________ (wash) his face at 6.15.
7. Thanh and Mai always _____________ (see) a movie on Saturday.
8. _____________he often _____________ (take) a bus to school?
9. We _____________ (be) student in class 8A.
10. She _____________often _____________ (not do) homework in the evening.
Exercise 5: Give the correct tense form of the verbs.
1. He usually _____________ (take) a taxi to the airport.
2. They _____________usually _____________ (not go) to school by bike.
3. _____________They ____________ (be) beautiful?
4. They often _____________ (visit) their parents on Saturday.
5. My and I always _____________ (go) to the countryside.
6. He _____________ (not be) at home now.
7. Our teacher usually _____________ (give) us many exercises.
8. He (go) _____________to the cinema every weekend.
9. She (come) _____________from Germany.
10. Daisy usually (go) _____________to work by car.
Exercise 6: Choose the best answer.
1. The weather ______ very nice today.
A. am B. is C. are D. be
2. Rome _____________ in Spain. It is in Italy.
A. am not B. are not C. is not D. not
3. Where _____________ my key?
A. be B. is C. are D. am
4. Dunford is a very modern town. ____________ many old buildings there.
A. There isn’t B. There be not C. There aren’t D. There are
5. Look! There ______ a photograph of George in the Newspaper!
A. be B. is C. are D. be not 6. Ann is at home but her children _______ at school.
A. are B. are not C. is D. is not
7. How many rooms ____ in your house?
A. is there B. are there C. there are D. there is
8. Cats ____ big animals.
A. be not B. is not C. are not D. are no
9. Who _____ your favorite actor?
A. are B. be C. is D. be not
10. ______ books expensive in your country?
 A. Is B. Is there C. Are there D. Are
11. He often _____________ the car at weekends.
A. washes B. wash C. don’t wash D. washs
12. What time ___________you often _____________ up every morning?
A. Does/ get B. do/get C. do/gets D. don’t/gets
13. _____________she_____________ English?
A. Do/likes B. Do/like C. Does/likes D. Does/like
14. He often _____________ (catch) a train to work.
A. catches B. catch C. catchs D. does catch
15. The cat _____________ (chase) mouse.
A. chases B. is chase C. chasing D. don’t chase
16. My old friend, Manh _____________ (write) to me twice a month.
A. Don’t write B. doesn’t writes C. writes D. writing
17. We (watch) _____________TV every night.
A. watching B. watches C. don’t watches D. watch
18. He (walk) _____________to work every day.
A. walks B. walkes C. walking D. walked
19. He (be) _____________in Ca Mau.
A. are B. is C. am D. being
20. They (be) _____________students.
A. doesn’t be B. are C. am D. don’t be
Exercise 7: Find and correct the mistakes.tìm và sửa lỗi sai
1. How often is he go to the movie?
2. Minh go to school every morning
3. She is often gets up at 5:30.
4. Don’t your school have two floors?
5. The students play sometimes soccer in the afternoon.
6. My brother isn’t have breakfast at 6:00.
7. The children has lunch at 11:00 everyday.
8. We alway go swimming on Saturdays.
9. Does she plays sports every day?
10. My mother doesn’t goes shopping on Sundays.
Exercise 8: Find and correct the mistakes.tìm và sửa lỗi sai
1. We seldom eats before 6.30.
2. The sun is sets in the West.
3. It doesn’t often hot in summer.
4. My mother sometimes buyes vegetable at this market.
5. It rain much in summer.
6. The earth circle the sun once every 365 days.
7. The farmers are work in the field every days 8. Rivers flow usually to the sea.
9. Mrs. Green always doesn’t go to work by bus.
10. That house is belong to Mr. Green.
2. PRESENT CONTINUOUS (THÌ HIỆN TẠI TIẾP DIỄN)
a. Form: (+) S + are/is/am + V-ing + O
 (-) S + aren’t/ isn’t/ am not + V-ing + O
 (-) Are/is/am (not) + S + V-ing + O?
b. Uses (Cách sử dụng)
- Dùng để chỉ một hành động đang diễn ra trong lúc nói.
Ex: Listen! The bird is singing.
- Một hành động dự kiến trong tương lai gần đã được sắp xếp xong.
Ex: They are playing tennis next week.
- Với chữ always đế diễn tả một hành động thường lặp lại thường xuyên, hay
một lời phàn nàn 
Ex: He is always taking exams. He is always studying.
- Hai hành động xảy ra song song ở hiện tại
Ex: She is cooking dinner while her husband is watching T.V now.
- Hành dộng có tính chất tạm thời
Ex: I often go to work by bus but today I am going by motorbike.
c. Advs (Trạng ngữ nhận biết)
- Now, right now, at the moment, at present, at the present time, always, still, 
- Hurry up, look, be careful, watch out .
- Sau câu cảm thán “!”
Ex: Look! The teacher is coming!
d. Những động từ thường không dùng trong các thì Tiếp diễn:
Verbs of thinking( động từ chỉ nhận thức): believe, doubt, guess, imagine, know, realize, 
suppose, understand
Verbs of the senses ( động từ chỉ cảm giác) hear, smell, sound, taste
Verbs of possession ( đọng từ chỉ sự sở hữu) belong to, have (meaning possess), own,
possess
Verbs of emotion( đọng từ chỉ cảm xúc): dislike, hate, like, love, prefer, regret, want, wish
Verbs of appearance( đọng từ chỉ sự xuất hiện): appear, seem
Others contain, depend on, include, involve, mean, measure, weigh, require
e. Cách chia động từ V-ing:
- Hầu hết các động từ thêm trực tiếp đuôi “ing” vào sau nó.
Ex: - She is doing her job.
- Nếu tận cùng động từ là nguyên âm “e” thì bỏ e đi rồi thêm đuôi “ing”.
Ex: - He is coming to the office at the moment.
- You are saving my life.
- Nếu động từ có công thức “1-1-1”, (1 phụ âm + 1 nguyên âm + 1 phụ âm) thì gấp đôi phụ
âm cuối rồi thêm đuôi ing.
 They are cutting down the trees in the forest.
 - The weather is getting hotter and hotter.
 B. PRACTICE ON TENSES
 II. PRESENT CONTINUOUS (HIỆN TẠI TIẾP DIỄN)
 Exercise 1: Rewrite each sentence as a positive, negative, or question.
 1. He (not watch) ____________________________________TV right now.
 2. At present they (sit) ___________________________ in the class? 3. This year we (learn) _________________________ English.
4. Look! Peter (play) ______________________ football in the schoolyard.
5. Be quiet! The baby (sleep) _______________________________.
6. Look! The man (smoke) ____________________________ there.
7. She (write) _______________________ to her parents now?
8. My father (work) ___________________________in the garden at the moment.
9. John (listen) _____________________________ to the radio now.
10. He (not play) _______________________chess at the moment.
Exercise 2: Put the verb in the present continuous tense.
1. The workers (work) ______________________ in the firm at the moment.
2. Please be quite! You (make) ____________________so much noise so I can’t
concentrate.
3. Tony (have) __________________a bath at the moment.
4. Listen! He (read) ____________________a story by Shakespeare.
5. At present Richard (study) _______________in London.
6. This term I (study) _______________philosophy and economics.
7. Janet (have) _______________a shower at the moment.
8. They (not/study) _______________at present.
9. Yukiko (have) _______________a bath now.
10. We (make) _______________a cake at the moment.
Exercise 3: Put the verb in the present continuous tense.
1. Jane (watch) _______________television at the moment.
2. Look! The boy (cry) ____________________.
3. Alice and Mary (put) ___________ the dishes away right now.
4. The farmer (work) _________________ in the field now.
5. Look! It (snow) _______________.
6. Phong (sleep) _______________ right now.
7. Mother (cook) ________________ some food in the kitchen at present.
8. Just a minute! I (look up) ______________ that word in the dictionary.
9. _______________you (write) ______________ a letter now?
10. They (not read) ____________________ books in the sitting room right now.
Exercise 4: Put the verb in the present continuous tense.
1. Look! They (play) _________________ football.
2. She (sweep) _______________ the floor now.
3. What________ she (do) ____________ now?
4. She (wash) ______________ the clothes at the moment.
5. Listen! Peter and Daisy (sing) ________________ now.
6. My brother (not watch) ___________TV now.
7. He (study) _____________ English this month.
8. ________you (work) __________ in the garden now?
9. Peter (talk) ________________ to Susan now.
10. She (listen) _______________to the radio in her bedroom at the moment.
Exercise 5: Choose the best answer.
1. I ________ Christine. Do you know where she is?
A. is looking B. are looking C. am looking D. look
2. It ________ dark. Shall I turn on the light?
A. is got B. are geting C. is getting D. are getting
3. They don’t have anywhere to live at the moment. They ________with friends until they
find somewhere. A. is staying B. are staying C. am staying D. stay
4. Things aren’t so good at work. The company ________ money.
A. is loosen B. are losing C. are loseing D. is losing
5. Have you got an umbrella? It ________to rain.
A. is starting B. are starting C. am starting D. start
6. You ________ a lot of noise. Can you be quieter? I ________ to concentrate.
A. is making/am trying B. are makeing/ am trying
C. are making/ am trying D. is making/ am trying
7. Why are all these people here? What ________?
A. am happening B. are happening C. is happening D. happening
8. Please don’t make so much noise. I ________ to work.
A. is trying B. are trying C. trying D. am trying
9. Let’s go out now. It ________ any more.
A. am raining B. isn’t raining C. are raining D. raining
10. You can turn off the radio. I ________ to it.
A. are not listening B. isn’t listening C. am not listening D. don’t listening
11. Kate phoned me last night. She is on holiday in France. She ________ a great time and
doesn’t want to come back.
A. is haven B. are having C. am haveing D. is having
12. I want to lose weight, so this week I ________ lunch.
A. am not eating B. isn’t eating C. aren’t eating D. is not eating
13. Andrew has just started evening classes. He ________ German.
A. are learning B. is learning C. am learning D. learning
14. Paul and Sally have an argument. They ________ to each other.
A. are speaking B. is speaking C. am speaking D. speaking
15. I ________ tired. I need a rest.
A. is getting B. are getting C. is geting D. am getting
16. Tim ________ this week. He is on holiday.
A. is not working B. are working C. am working D. works
17. Listen! Sam ________ the piano.
A. are playing B. am playing C. plays D. is playing
18. They ________ a new hotel in the city center.
A. are building B. am building C. is building D. build
19. Look! Somebody ________ in the river.
A. is swiming B. are swimming C. am swimming D. is swimming
20. The phone ________.
A. aren’t ringing B. isn’t ringing C. don’t ringing D. doesn’t ring
Exercise 6: Choose the best answer.
1. (it start) ________ to rain?
A. Am it starting B. Are it starting C. Does it starting D. Is it starting
2. Sue ________ to become a doctor?
A. are playing B. am playing C. plays D. is playing
3. You (take) ________.your daughter with you?
A. Are you taking B. is you taking C. am you taking D. are you taking
4. The dog (play) ________ with the kids?
A. Are the dog playing B. Am the dog playing
C. Does the dog playing D. Is the dog playing
5. They (come) ________ tonight?
A. am they coming B. is they coming C. Are they coming D. is they coming 6. Be quiet! The baby ________.
 A. is sleeping B. sleep C. sleeps D. are sleeping
 7. Look! A man ________ after the train. He wants to catch it.
 A. is runing B. runs C. run D. is running
 8. I ________an exercise on the present tenses at this moment.
 A. is doing B. are doing C. am doing D. do
 9. My father ________ in the garden and it ________ now.
 A. is working/ is raining B. works/ rains
 C. working/ raining D. are working/ are raining
 10. Mai ________ some food at present. She always ________ in the morning.
 A. is cooking/ cooks B. cooks/ is cooking C. cooks/ cooks D. is cooking/ is cooking
 11. The students ________ the test right now?
 A. Are....do B. Are......... doing C. Is ......... doing D. Do............. do
 12. Now She ________ for her husband in the rain
 A. are waiting B. is waiting C. waits D. wait
 13. His brother ________ a novel at the moment?
 A. Are....... writing B. are writing C. is writing D. Is............writing
 14. The children ________ in the kitchen at present.
 A. isn’t playing B. am not playing C. aren’t playing D. play
15. Lan ________ to the English teacher now.
A. isn’t speaking B. aren’t speaking C. doesn’t speak D. don’t speak
16. They ________ the Christmas dinner at present.
A. are preparing B. is preparing C. prepare D. prepares
17. John ________ that car now.
A. am driving B. is driving C. are driving D. is driveing
18. The workers ________a new house right now.
A. are building B. am building C. is building D. build
19. Tom ________ two poems at the moment?
A. Are..... writing B. are writing C. is writing D. Is............writing
20. The chief engineer ________ all the workers of the plant now.
A. is instructing B. are instructing C. instructs D. instruct
Exercise 7: Find and correct the mistakes.
1. He paints his pictures at the moment.
2. We plant the herbs in the garden at present.
3. They makes the artificial flowers of silk now.
4. Your father are repairing your motorbike at the moment.
5. Look! The man takes the children to the cinema.
6. Listen! The teacher are explaining a new lesson to us.
7. Be careful! You brings ten glass bottles.
8. Ba studies Math very hard now.
9. We is have dinner in a restaurant right now
10. I watching TV with my parents in the living room now.
Exercise 8: Find and correct the mistakes.
1. Some people drink coffee now.
2. At present, he are composing a piece of music .
3. My father listens to the radio now.
4. Where is your mother? - She have dinner in the kitchen.
5. Mr. Nam don’t work at the moment.
6. The children plays in the park at the moment. 7. John not reading a book now.
8. What do you do tonight?
9. Silvia doesn’t listen to music at the moment.
10. Maria sits next to Paul right now.
3. PRESENT PERFECT (HIỆN TẠI HOÀN THÀNH)
a. Form: (+) S + have/ has + Vp2/ed+ O
 (-) S + have/ has+ not + Vp2/ed+ O
 (?) Have/ has (not) + S+ Vp2/ed+ O?
b. Uses (Cách sử dụng)
- Diễn tả 1 sự việc vừa mới xảy ra.
Ex: I have just finished the financial report. (Tôi vừa hoàn thành xong bản báo cáo tài chính)
- Diễn tả 1 sự việc đã xảy ra trong quá khứ nhưng còn liên quan đến hiện tại.
Ex: My husband has worked for this company for 2 years. (Chồng tôi đã làm cho công ty này
được 2 năm - Nghĩa là: cách đây 2 năm đã bắt đầu làm, hiện tại vẫn có thể đang làm cho công 
ty này
hoặc không)
- Diễn tả 1 sự việc đã xảy ra ở một thời điểm không xác định trong quá khứ.
Ex: She has been in China for a long time. (Đã có một thời gian dài cô ấy ở Trung Quốc)
- Nhấn mạnh đến trải nghiệm bản thân (the first/second/third/last... time), nhấn mạnh kết
quả:
Ex: + I have seen that film three times. (Tôi đã từng xem bộ phim này 3 lần)
+ This is the first time that he has been in the USA. (Đây là lần đầu tiên anh ấy đến Mỹ)
c. Advs (Trạng ngữ nhận biết)
just, recently, lately : gần đây, vừa mới before : trước đây
already : rồi ever : từng
never : không bao giờ, chưa bao giờ yet : chưa
since : kể từ khi for : khoảng
so far = until now = up to now = up to the present: cho đến bây giờ
d. Một số lưu ýđối với thì hiện tại hoàn thành:
- Phân biệt “Since” và “For”:
since + mốc thời gian
for + khoảng thời gian
Ex: - I’ve known Anna since October.
- I’ve known Anna for two months.
- Phân biệt “yet” và “already”:
yet : dùng trong câu phủ định và câu nghi vấn
already: dùng câu khẳng định
Ex: - He hasn’t come yet.
- I’ve already posted the letters.
- Thường dùng “ever”, “never” với Hiện tại hoàn thành:
Ex: - He has never been there.
- Have you ever eaten snake meat?
- Phân biệt “Have/ has been” khác với “have/ has gone”:
Ex: (a) Mr. Smith is not here at the moment. He has gone to a meeting in London
(b) Amada has been to the travel agent. She has your tickets for Hong Kong
Trong 2 ví dụ trên, ví dụ (a) có thể hiểu là Mr. Smith vẫn đang ở buổi họp trong khi đó ở ví
dụ (b) Amada đãđi đến đó và trở về rồi.
- Một sốlưu ýkhác: ➢ Trong các mệnh đề diễn tả sự so sánh hơn nhất, số thứ tự, sự duy nhất hay số lần thực
hiện hành động → Động tự chia ở Hiện tại hoàn thành.
Ex: - This is the most interesting story I have heard.
- This is only foreigner I have ever known.
(1) It’s the first / second / time 
+ HTHT
(2) This is the first / second time
Ex: - It’s the first time I have driven a car.
- This is the first time she has lived in New York.
➢ It’s + khoảng thời gian + since + sb last did sth: Đó là khoảng thời gian kể từ khi ai đó
làm gì.
Ex: I have seen her for 3 days. →It’s 3 days since I last saw her.
 III. PRESENT PERFECT (HIỆN TẠI HOÀN THÀNH)
 Exercise 1: Rewrite each sentence as a positive, negative, or question.
 Example: She (be) has been here for several days.
 She has not been here for several days.
 Has she been here for several days?
 1. Tom (see) ______________this film before.
 2. I (finish) ______________ my exercise already.
 3. They (live) ______________ here since 1990.
 4. My father (just wash) ______________ his car.
 5. The students (discuss) ______________ the question recently.
 6. Mary (never be) ______________ to Ha Noi.
 7. We (know) ______________ each other for 5 years.
 8. So far we (learn) ______________ five lessons.
 9. We (be) ______________ pen pals for a long time.
 10. They (stay) ______________ here since last week.
 Exercise 2: Put the verbs in brackets in the correct tense.
 1. Bob (see) ______________ this movie before.
 2. Sandra (lend) ____________ her brother $ 200 so far.
 3. Rashid (just pass) ____________ his driving test.
 4. Karen (study) ____________________ Italian for three years now and is still studying.
 5. The teacher (already tell) ____________ to be quite.
 6. Tim (not take) ____________ many photos yet.
 7. Jorge (read) ____________ the newspaper already.
 8. We (not begin) _____________ to study for the test yet.
 9. John and I (be) ______________ pen pals for nearly 3 years.
 10. He (wear) ___________ the same coat since he moved here.
 Exercise 3: Put the verbs in brackets in the correct tense.
 1. I (not see) _____________ your brother recently.
 2. They (not contact) _______________ to each other for a long time.
 3. How long _______________you (study) ______________ English?
 4. How many times _________ you (see) ____________him since he went to Edinburgh?
 5. Who is that woman? I (never/ see) _______________ her before.
 6. We (be) ____________ from French. We (be) ______________ there for 20 years.
 7. I (see) __________ that film several times because I like it.
 8. Mary (lose) _________________ her hat for 2 days.
 9. He (not finish) _______________ doing it yet.
 10. He (not see) ____________ him since Christmas. Exercise 4: Put the verbs in brackets in the correct tense.
1. I (live) _______________ in Ho Chi Minh City since 1975.
2. He (just see) ______________ her.
3. They (already show) _______________ the film.
4. I’m sorry the car is not here. I (just sell) ______________ it.
5. The Bakers (be) ______________ in New York for 3 months.
6. My brother (use) ______________ this computer for 2 years.
7. They (live) ________________ in this street for a long time.
8. Mr. Green (teach) ______________ French since he left London in 1997.
9. She (not speak) _________________ to me since last week.
10. Up to now, Hoa (work) _______________ very hard.
Exercise 5: Put the verbs in brackets in the present perfect or the simple past tense.
1. We (never watch) _________that TV programme.
2. We (watch) _________ a good programme on TV last night.
3. He (read) _________ that novel many times before.
4. He (read) _________that novel again during my last vacation.
5. I (have) _________ a little trouble with my car last week.
6. However, I (have) _________no trouble with my car since then.
7. I (not see) _________ John for a long time. I (see) _________ him 3 weeks ago.
8. The school bell (ring) _________. We must go now.
9. I (meet) _________Mary last night. She (become) _________ a very big girl.
10. He is very thirsty. He (not drink) _________ since this morning.
Exercise 6: Put the verbs in brackets in the present perfect or the simple past tense.
1. It is very hot. Summer (come) _________.
2. They (study) _________at this school for 7 years now.
3. They (begin) _________ to study at this school 7 years ago.
4. Since (you know) _________when her ?
5. How long ago (he start) _________to learn French ?
6. She (lose) _________ her handbag on the train yesterday morning.
7. My mother (be) _________ in hospital for a long time and she cannot go home yet.
8. His dog (just run) _________ out of the garden.
9. Mr Brown (travel) _________ by air several times in the past.
10. He (travel) _________to Mexico by air last summer.
Exercise 7: Choose the best answer.
1. This is the most interesting novel _______________
A. I’ve read B. I had read C. I’ve never read D. I’ve ever read
2. I haven’t seen you _______________
A. since a long time B. for ages C. ages D. for long existence
3. It _______________ every day so far this week.
A. rained B. has rained C. rains D. is raining
4. I _______________any letter from him yet.
A. haven’t received B. will receive C. don’t receive D. didn’t receive
5. We _______________to Dalat several times. It’s a foggy city.
A. were B. have been C. were being D. had been
6. I haven’t met him since he _______________school.
A. left B. was leaving C. had left D. was left
7. My uncle _______________on this farm since he was 20.
A. has worked B. have worked C. worked D. was working