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2.4. Mustn't and needn't

2.4.1. Study the following examples.

The baby is asleep. You mustn 't shout.

You needn't say anything if you don't want to.

I can hear you quite well. You needn 't shout. Must I return the books today? - No, you needn't. You can do it tomorrow.

Must I return the books today? - Yes, you must. He has left the army and doesn 't need to wear a uniform any more.

Note: Must not is used to express prohibition (Do not do this!)- Need not + the simple form of a verb is used to express lack of necessity.

2.4.2. Complete the sentences with mustn't or needn't.

1. I've bought everything, so you ... go shopping. 2. She has recovered and ... stay in bed. 3. Tom gave me a letter to post. I... forget to post it. 4. Shall I turn on the light? - No, you .... It's still light in the room. 5. The work isn't urgent. You ... do it today. 6. Must he speak to the manager? - No, he.... The matter isn't very urgent. 7. The meeting is very important. We ... be late. 8. You ... take an umbrella. It isn't going to rain. 9. Look after the books, please. You ... lose them, 10.1... forget my keys or I won't get in. 11. You ... bring sandwiches. We can stop at a cafe. 12. You ... wear your best clothes. You can wear what you like. 13. You ... make any noise going into the house. It's very late and everybody's asleep. 14. My room is a mess, but I... clean it before I go out tonight. I can do it in the morning. 15. Bill is in the darkroom developing the negatives of the photos he took on his last trip to Pern. You ... open the door because the light will ruin the pictures. 16. You ... exert yourself. You're still not fully recovered from your surgery. 17. Thanks goodness we ... eat fish again tonight. Dad didn't catch any today. 18. He has retired. He ... work any more. 19. We ... check the figures again. I think they are right. 20. In this

school pupils ... smoke. They ... wear school uniform, but they ... wear dirty clothes. 22. You ... take a jacket. It's rather warm. 23. Sally and Dave ... attend the meeting, but the sales staff... miss it, as several matters concern them.

2.5. Must and may

2.5.1. Study the following examples.

You 've been travelling all day. You must be tired. (I am sure that you are tired). Ann isn 't at home. She may be at the office. (Per­haps she is at her office)

Note: Must is used to express a strong degree of certainty about a situation. May expresses uncertainty and doubt.

2.5.2. Complete the situations with must or may.

1. Do you know if David is at home? - He ... be in his office but I am not sure. 2. Are they British? - Yes, they ... be British. 3. That dress you bought yesterday is very good quality. It... be very expensive. 4. Where's Ann? - I don't know. She ... be at the library. She sometimes goes there after classes. 5. He's got a few cars, a yacht and a helicopter. He ... be very rich. 6. Do you know if Ann likes ice-cream? - She... but I am not sure. 7. Dave isn't answering the phone. He ... be out. 8.1 had my keys a moment ago. They ... be here somewhere. 9. Is that a famous person over there in the middle of that crowd? - Yes, it... be. Everyone's trying to get her autograph. 10. Have you heard anything from Edd? Is he still in Africa? - He ... be, or he ... be already on his way home. I'm just not sure. 11.1 hear Laura has been offered a job at a top computer firm. - That's wonderful. She ... very pleased. 12. Is that volcano dormant or active? - Active.

According to experts, it... erupt again in the very near future. I з \Ve ought to call before we drop in on Peter and Mary. They -•• busy. 14.1 hear Joe has received a scholarship and will be able to attend the university. - Wonderful. He ... be very happy to have the matter finally settled. 15. Isn't Margaret's daughter over 16?- She ... be. I saw her driving car, and you have to be at least 16 to get a driver's licence. 16. It can't be true. It ... be a lie. 17. This dog ... belong to Harry. It's got his address on its collar. 18. Where is Pau­la? - She ... be in the garden. I remember Father asking her to help him.