1.Can i get you a cup of tea?
_Can't I get_you a cup of tea?
2.Jack grew up in London.
Jack_didn't grow up_in London.
3.Dave might come to our place,
Dave_might not come_to our place.
4.Liza gave uo smoking last year.
Lizza__didn't give up smoking_last year.
5.John used to sing a lot when he was 16
John_didn't sing_a lot when he was 16.