1. they don't have to do their homework.

2. the boy doesn't have to run if he had been broken his leg.

3. mother doesn't have to cook a meal if she finds another labour.

4. sam doesn't have to do much hard work because he's too young.

5. they don't have to do any attention on them.

1. they have to do their work.

2. the girl must have to go to the cinema last Sunday.

3. maybe, that boy has done his work and now he's going to play.

4. I have to read this book now.

5. the boy has to work in the garden.

1. you needn’t cut the grass.

2. as you worked late yesterday you needn't come in until ten tomorrow morning.

3. while you needn't work, you can get some rest.

4. if you needn't my help I'll go away.

5. when I was a child I needn't any gadgets.