I. Cho dạng quá khứ của các động từ sau.
1. do _______________ 11. buy ________________________
2. teach _______________ 12. have ________________________
3. send _______________ 13. take ________________________
4. spend _______________ 14. go ________________________
5. begin _______________ 15. make ________________________
6. cut _______________ 16. think ________________________
7. put _______________ 17. see ________________________
8. give _______________ 18. eat ________________________
9. write _______________ 19. sing ________________________
10. be _______________ 20. wear ________________________
1. did
2. taught
3.send
4. spent
5. began
6. cut
7. put
8. gave
9. wrote
10. was, were
11. bought
12. had
13. took
14. went
15. made
16. thought
17. saw
18. ate
19. sang
20. wore
1. Do `→` Did
2. Teach `→` Taught
3. Send `→` Sent
4. Spend `→` Spent
5. Begin `→` Began
6. Cut `→` Cut
7. Put `→` Put
8. Give `→` Gave
9. Write `→` Wrote
10. Be `→` Was, Were
11. Buy `→` Bought
12. Have `→` Had
13. Take `→` Took
14. Go `→` Went
15. Make `→` Made
16. Think `→` Thought
17. See `→` Saw
18. Eat `→` Ate
19. Sing `→` Sang
20. Wear `→` Wore