C. Look at the chart and make sentences using have to, don’t have to, or can’t

	obligation	no obligation	prohibition
Airline pilots Union members University teachers Army officers Police officers	have good eyesight pay a subscription be graduates go to training courses be over 1.75m tall	work office hours be qualified teachers carry guns (UK)	drink before flying work during a strike go on strike

e.g. Airline pilots don't have to have excellent eyesight.

They don’t have to work office hours.

D. Change each of the following sentences using might, can’t, must, and a suitable infinitive.

1) It’s possible that they will give us the discount that we want.

They … might give us the discount we want.

2) Judging by the phone bill, I am sure she has been making long international calls.

Judging by the phone bill, she …

3) The factory is on a 3-day week. I am sure they aren’t selling many cars.

The factory is on a 3-day week. They…

4) It was a very bad deal. I am sure they lost a lot of money.

It was a very bad deal. They …

5) There is a chance she will be promoted at the end of the year.

She …

E. Match the comments in column A with the comments in column B.

A	B
I’m afraid I’m tied up all this week.	Ok, I’ve got them here. Shall I fax them to you?
Can you turn the heating down?	That’s OK. Shall I pick you up from the airport?
Is the next interviewee here yet?	That’s OK. Shall I ring back this afternoon?
Is that the new screen I ordered?	Yes. Where shall I put it?
I am sorry, but I am in a meeting now.	I am not sure yet. Shall we send you a quote in a few days?
How much is this going to cost?	No, but shall I open the window for you?
I don’t know London very well.	That’s OK. Shall we arrange a meeting for next week?
I need to see the plans. Today, if possible.	Yes, she is. Shall I send her in?