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

2. This is the first time one has challenged his authority.

3. It is 2 years since she left university 

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

22. This is the first time everyone has challenged his authority.

23. It is 2 years since she left university.

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

25. It is over a year since I was able to see them.

1.                 They have never heard such a thing before.

ð    This is the first time _hearding this_______________________________________________

2.                 Noone has challenged his authority before.

ð    This is the first time ____to challenge the power____________________________________________

3.                 She left university 2 years ago

ð   it was when she left university  _____________________________________________________________

4.                 it was when she left university

ð    I did saw her when she leaving university__________________________________________________