1.She hasn't gone out with him for 5 months
The last time she went out with him was 5 months ago.

2.We haven't seen such a cruel mother before.
This is the first time we have seen such a cruel mother.

3.It's two years since we last saw Mr. Jones.
We haven't seen Mr. Jones for 2 years.

4.This is the first time I have visited the USA
I haven't visted the USA before.

5.I have learnt English for 10 years now
I began learnting English in 10 years now.

6.She moved to London 20 years ago
She has moved to London since 20 years. 

7.The Pikes haven't visited Paris for 2 years.
The last time the Pikes visited Paris was 2 years ago.

8.I stopped writing to him a week ago
I haven't stopped writing to him for a week.

9.Mary has leant French for 6 years
It's 6 years since Mary learnt French.

10.When did your father buy that car ? 
How long has your father bought that car ?
 

1. The last time she went out with him was 5 months ago.

2.This is the first time we have seen such a cruel mother.

3.We haven't seen Mr. Jones for 2 years.

4.I haven't visted the USA before.

5.I began learnting English in 10 years now.

6.She has moved to London since 20 years. 

7.The last time the Pikes visited Paris was 2 years ago.

8.I haven't stopped writing to him for a week.

9.It's 6 years since Mary learnt French.

10.How long has your father bought that car ?