4.
1) watch a film
2) do sports
3) find a book
4) see fish
5) see a play
5.
1) mustn’t
2) have to
3) mustn’t
4)can’t
5) must
6.
1) Tracy has to do the washing up.
2) Sarah is the most intelligent girl in our university.
3) We have to wear school uniform.
4) Hyde Park is the biggest park in London.
5) Susan doesn’t have to clean the flat.