助動詞：許可、義務、禁止、必要性

この練習では、must、have to、can、should、needなどの助動詞を使って、規則、許可、義務、必要性について話す練習ができます。

1. You _____ smoke in this area.

should

mustn't

can’t

2. You _____ come if you’re not feeling well.

mustn’t

ought to

don’t have to

3. Drivers _____ wear seat belts at all times.

have to

could

might

4. _____ say anything until you’ve seen a lawyer.

You must not

You’d better not

You haven’t to

5. _____ leave early today if I finish all my work?

May I

Must I

Ought I

6. _____ wear a helmet on this construction site.

You might

You have to

You ought to

7. _____ brought your own tools—they had everything.

You needn’t have

You shouldn’t have

You mustn’t have

8. _____ use your phone during the exam.

You’d better

You might not

You’re not supposed to

9. _____ enter without a valid ticket.

You mustn’t

You shouldn’t

You don’t have to

10. _____ cancel the event because of the storm.

We had to

We should

We could have

11. _____ tell her the truth as soon as possible.

You can

You ought to

You mustn’t

12. Lunch is already provided at the event, so you _____ bring anything.

mustn’t

should

don’t have to