Đáp án là: in ⇒ on.

Đáp án là: does ⇒ do.

Tham khảo 

Câu 5 :

1. wish wishes

2. rained rain

3. was were

4. have had

5. didnt rain hadnt rain

6. gives would give

7. studied had studied

8. will would

9. stops stopped

10. are were

11. is - were

12. will would

13. am were

14. been be

15. wish wishes

Câu 6 :

1. I wish I didnt have to study.

2. I wish we hadnt had a lot of homework yesterday.

3. I wish it didnt rain heavily.

4. I wish it hadnt been cold last night.

5. I wish they didnt work slowly.

6. I wish I were good at English.

7. I wish he didnt studied badly.

8. I wish he liked playing sports.

9. I wish I had a computer.

10. I wish today were a holiday.

11. I wish I could sing this song.

12. I wish he hadnt been punished by his mother.

13. I wish they would come here again.

14. I wish I he would go swimming with me.

15. We wish we had understood them.

16. I wish I wouldnt be late for school.

17. I wish the bus hadnt been late today.

18. I wish she liked this place.

19. I wish these students hadnt talked too much in class.

20. I wish I could play basketball.

tách nhỏ ra

1. I have to study hard.

I wish I studied hard

2. We had a lot of homework yesterday.

I wish we hadn't got a lot of HW yesterday

3. It is raining heavily.

I wish it wasn't raining heavily

4. It was cold last night.

I wish it wasn't cold last night

5. They work slowly.

I wish they worked faster

6. I am not good at English.

I wish I was good at English

7. He studies badly.

I wish he studied well

8. He doesnt like playing sports.

I wish he like playing sports

9. I dont have a computer.

I wish I had a computer

10. Today isnt a holiday.

I wish today was a holiday

11. I cant sing this song.

I wish I could sing this song

12. He was punished by his mother.

I wish he didn't be punished by his mother

13. They wont come here again.

I wish they came here again

14. He wont go swimming with me.

I wish he went swimming with me

15. We didnt understand them.

We wish we could understand them

16. I will be late for school.

I wish I wouldn't be late for school

17. The bus was late today.

I wish the bus wasn't late today

18. She doesnt like this place.

I wish she like this place

19. These students talked too much in class.

I wish these students could be quiet

20. I cant play basketball.

I wish I could play basketball

1 could => can

2 rained => rain

3 was => were

4 have => had

5 didn't rain => hadn't rained

6 gives  => would give

7 studied => had studied

8 will => would

9 stops => stopped

10 are => were

11 is => were 

12 will => would

13 am => were

14 been => be

15 wish => wishes

1. wish ⇒ wishes 

2. rained ⇒rain 

3. was ⇒ were

4. have ⇒ had 

5. didn’t rain ⇒ hadn’t rained

6. gives up ⇒ would give up 

7. studied⇒ had studied 

8. will ⇒ would 

9. stops ⇒stopped 

10. are ⇒ were

11. is ⇒ was / were 

12. will come ⇒ would come 

13. am ⇒ was / were 

14. been ⇒ be 

15. wish ⇒ wishes 

Đáp án là: are ⇒ is.

Đáp án là: don’t ⇒ doesn’t.

Đáp án là: from ⇒ to.

Đáp án là: twenty ⇒ twentieth.

Đáp án là: an ⇒ a.