Modal verbs

_____ I interrupt you?

• must

• may

They _____ make their reservations soon; otherwise the hotel will be full

• should

• might

- I've got really bad toothache

- You _____ go to the dentist

• need

• should

You _____ wear a suit and tie; the dinner party is not formal

• don't have to

• mustn't

I can't see the floor anymore; you really _____ clean this room

• might

• ought to

_____ you please turn down the volume? I'm trying to concentrate on my homework

• could

• should

You _____ use your mobile phone during the examinations; it's against the rules

• needn't

• mustn't

I _____ go to the bank yesterday to casj a cheque

• had to

• ought to

I was so far away from the stage that I _____ see very well

• can't

• couldn't

You _____ wake up late again or you will lose your job

• had better not

• don't have to