GIÚP MÌNH GẤP VỚI!!!!!!!!!!!!!!!!!!!

1.We have looked for a flat 2 months ago and we are still looking.

2.I haven't been to a night club before.

3.This is the first time they have heard such a thing.

4.This is the first time his authority has been challenged.

5.It is 2 years since she left university.

6.I have never known a more warm-hearted person than my mother.

7.It is been over a year since the last time I saw them.

8.It is rained since 2 o'clock

9.It has the first time I have been to the ballet.

10.It is twenty years since John and Mary last moved to Edinburgh.

11.For two months now the police has been looking for him.

12.This is the first time I have seen a dirtier-looking dog.