Ex. 1

1) don’t have to

2) have to

3) have to

4) don’t have to

5) does she have to take the dog for a walk every day?

Ex. 2

Peter has to wear a uniform.

Peter doesn’t have to work in an office.

Peter has to carry a big bag.

Peter doesn’t have to work on Sundays.

Peter has to work on Saturdays.

Peter doesn’t have to use a computer.

Ex. 3

1) a

2) b

3) a

4) a

5) b

Ex. 4

1) mustn’t

2) have to

3) have to

4) have to

5) have to