Pag.42 es.A

1. I don’t believe you. It can’t be true.
2. He should consult a doctor before he goes on a diet.
3. Could you open the window , please?
4. I can climb that wall. It isn’t very high.
5. You can keep yourself fit by walking a certain distance every day.
6. You have to be at the airport two hours before your flight. Don’t be late.

Pag.42 es.B

1. A friend of yours has a toothache.

You should go to the dentist.

2. You are sure your family isn’t at home because the lights aren’t on.

You can call your parents.

3. What do you think when you are waiting for your friend outside the cinema and he hasn’t come yet?

Why doesn’t he arrive?

4. Your friend is leaving for holidays and you want to tell him/her it isn’t necessary to take any warm clothes with him/her.

I can send a sms.

5. You are on a bus and a window is open. what would you ask the woman next to in to do?

Could you close the window, please?

6. You want to help an old woman cross a road. What would you say to her?

You could cross!

Pag.43 es.C

1. She mustn’t have won the prize.
2. She may have lost her keys.
3. They must have rented a house in the suburbs.
4. She needn’t do the laundry.
5. You could pack earlier.
6. He may have overslepted.

Pag.43 es.D

1. You oughtn’t to have been late.
2. She had to paint the gate yesterday.
3. They speak Japanese very well. They must have lived in Japan in the past.
4. She didn’t have to do the dishes.
5. I had left my keys in the house but I was able to get in trough the window.
6. Gloria needn’t have cleaned the house but she has already done it.
7. They could have crashed into that wall. But luckily the driver braked hard at the last minute.

Pag.43 es.E

1. Must
2. Cannot
3. Might
4. Needn’t
5. Have to
6. Use to
7. should