5. put in must/ had to/ mustn’t/ needn’t. 1) you go. you can stay here if you want. 2) it’s fantastic film. you see it. 3) we’ve got enough food, so we go shopping. 4) we didn’t have any food yesterday, so we go shopping. 5) i want to know what happened. you tell me. 6) you tell sue what happened. i don’t want her to know. 7) i hurry or i’ll be late. 8) “why were you so late? ” “i wait half an hour for a bus.” 9) we decide now. we can decide later.

1. needn't.
2. must.
3. needn't.
4. had to.
5. must.
6. mustn't.
7. must.
8. had to.
9. needn't. 

1) You needn’t go. You can stay here if you want.
2) It’s fantastic film. You must see it.
3) We’ve got enough food, so we needn’t go shopping.
4) We didn’t have any food yesterday, so we had to go shopping.
5) I want to know what happened. You must tell me.
6) You mustn’t tell Sue what happened. I don’t want her to know.
7) I must hurry or I’ll be late.
8) “Why were you so late?” “I had to wait half an hour for a bus.”
9) We needn’t decide now. We can decide later.