Modal Verbs: Must, can, should.

This modal verb expresses an ability.

• Should

• Must

• Can

This modal verb is used when you ask for permission

(a)  

To show personal obligation, this modal verb is used.

• Should

• Must

• Can

• Must not

To express prohibition, we use (a)  

_____ you hold your those blueprints for me, please?

• Can't

• Must

• Mustn't

• Can

You ___________ take your eyes off the road while you are driving. It's a rule.

• Must

• Mustn't

• Should

• Shouldn't

I can't work today. I burned my foot.

• Request

• Possibility (impossible)

• Permission

Kevin, you (a)   eat so much M&Ms. It's not healthy.

Michael ___________ buy a new car now. He has a new a job.

• Can't

• Can

• Must

• Mustn't

You ____ put on a helmet. It's dangerous.

• shouldn't

• should

• can't

• mustn't