Ex3
1am
2is
3 aren't
4 was
5are
6are
7are
8will be
9was
10will be
11 were, arent
Ex4
1your shoes are very dirty
2my mother is a teacher
3 the house isnt very big
4the shops arent open today
5my keys are in my bag
6 they were present at the meeting yesterday
7peter is 18 years old
8 you arent very tall
9the weather will be good tomorrow
Ex5
1 is your mother at home?
2 are your parents well?
3 is your job interesting?
4 are the shops open today?
5 are you interested in sport?
6are your children at school?
7 why are you late?