Modals of Possibility or Necessity

Obligations: Which modal verb expresses an obligation?

• have to

• must

• should

• can

Which modal do we use to say something is necessary?

• should

• can

• need to

• must

If you want to delay handing in your project, you ________________ ask the teacher first.

• shouldn't

• needn't

• have to

• don't have to

Jerry SHOULD study more if he wants to succeed.

• should = advice

• should = obligation

• should = ability

• should = desire

Dennis! You ... hit your sister ever again!

• mustn't

• don't have to

• must

We ... get up early on weekends.

• don't have to

• mustn't

• have to

You________________ give me the money today, you can give it to me tomorrow.

• don't have to

• shouldn't

• need to

• should

You _______________ go to bed so late – you’ll be exhausted tomorrow.

• shouldn't

• don't have to

• needn't

• should

You ____________________ buy some food, because we’ve got nothing for dinner.

• need to

• needn't

• don't have to

• have to

You __________________ buy a camera, I’ll lend you one if you like.

• don't have to

• have to

• should

• need to