11.The football match didn’t start until the lights were on.
It was until the lights were on that the football match started.
It was not until the lights were on the football match started.
It was not until the lights were on that the football match started.
It was until the lights were on the football match started.
12.Because they didn’t know the truth, they failed.
If they had not known the truth, they would have failed.
If they knew the truth, they wouldn’t fail.
If they did not know the truth, they would fail.
If they had known the truth, they wouldn’t have failed.
13.Nam and his brother couldn’t swim until 1910.
It was not until 1910 that Nam and his brother could swim.
It was not until 1910 Nam and his brother could swim.
It was not until 1910 that Nam's brother could swim.
It was not until 1910 Nam's brother could swim.
14.She can’t buy the dictionary because she doesn’t have enough money.
If she had had enough money, she could have bought the dictionary.
If she had not had enough money, she could not have bought the dictionary.
If she had enough money, she could buy the dictionary.
If she did not have enough money, she could not buy the dictionary.
15.She tried to get up early. She didn’t want to be late for her class.
She tried to get up early so as to be late for her class.
She tried to get up early so as not to be late for her class.
She tried to get up early so as that not to be late for her class.
She tried to get up early so as that to be late for her class.
16.They were demonstrating the new video system when I went there yesterday.
The new video system was being demonstrated.
The new video system when I went there yesterday was being demonstrated .
The new video system was being demonstrated when I went there yesterday.
The new video system was demonstrated when I went there yesterday.
17.She wasn't allowed to open her presents until her birthday.
It was until her birthday that she was allowed to open her presents.
It was until her birthday she was allowed to open her presents.
It was not until her birthday she was allowed to open her presents.
It was not until her birthday that she was allowed to open her presents.
18.She makes good cakes.
Good cakes are made.
Good cakes are make.
Good cake are made.
Good cake are make.
19.She doesn’t eat much sugar because she is fat.
If she were not fat, she would eat much sugar.
If she were fat, she would not eat much sugar.
If she had not been fat, she would have eaten much sugar.
If she had been fat, she would not have eaten much sugar.
20.You did not have breakfast, so you were hungry.
If you had had breakfast, you wouldn’t be hungry.
If you had had breakfast, you wouldn’t have been hungry.
If you hadn’t had breakfast, you wouldn’t have been hungry.
If you hadn’t had breakfast, you would be hungry.

#NOCOPY

=>

11. It was not until the lights were on that the football match started. ( It was not until..that : mãi cho đến khi...thì...mới)

12. If they had known the truth, they wouldn’t have failed. ( câu đk loại 3 If S had V3/ed, S would have V3/ed)

13. It was not until 1910 that Nam and his brother could swim. 

14. If she had enough money, she could buy the dictionary. ( câu đk loại 2 If S V2/ed, S would V)

15. She tried to get up early so as not to be late for her class.  ( so as (not) to V : để (không) ) 

16. The new video system was being demonstrated when I went there yesterday. ( bị động QKTD was/were being V3/ed)

17. It was not until her birthday that she was allowed to open her presents.

18. Good cakes are made. ( bị động HTĐ is/am/are V3/ed)

19. If she were not fat, she would eat much sugar. ( câu đk loại 2)

20. If you had had breakfast, you wouldn’t have been hungry. ( câu đk loại 3)