15. After seeing the film for himself, my father has stopped criticising it.
⇒ Since seeing the film for himself, my father has no longer criticised it
16. John hasn’t done any revision since spring term.
⇒ The last time John did a revision was spring term

Ex2:

 1. She hasn't still decided what career to follow

2. It is 2 years since they last talked to each other

3. It is the most ridiculous lie she has never heard

4. How long ago did he  quit school?

5. She gave been writting novels four years ago

6. It’s the first time they go to a Chinese restaurant

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15. After seeing the film for himself, my father has stopped criticising it.
⇒ Since seeing the film for himself, my father has no longer criticised it
16. John hasn’t done any revision since spring term.
⇒ The last time John did a revision was spring term.

II

Exercise 2:

1

She still haven't decided what career to follow

2.  

It's  two years since they haven't talked to each other

3.  

It is the the most ridiculous lie she has ever heard

4. 

How long  ago did you find school?

5.  

She has been writing novels four years

6. 

It’s the first time they go to a Chinese restaurant