M5.1 Grammar: Modals of Obligation

Citizens _____ pay the taxes.

• have to

• must

• need to

• should

You ____ stop when the traffic lights are red.

• have to

• must

• need to

• should

I ____ eat so much sugar.

• don't have to

• mustn't

• needn't

• needn't to

Policemen _____ drink on duty.

• don't have to

• mustn't

• needn't

• oughtn't

I ____ visit my doctor yesterday.

• had to

• musted

• should

• ought to

He ____ ask for help.

• didn't have to

• didn't must

• didn't ought

• needn't to

I think you ____ see a doctor about this red spot.

• need

• must to

• should

• ought

You _____ spend so much time on the Internet. It's not good for you.

• haven't to

• don't must

• needn't

• shouldn't

We ______ get her some flowers for her birthday.

• must to

• should to

• ought to

• has to

I ______ to her but I haven't had time.

• should have written

• ought have written

• should write

• ought write