3. He had been late to office everyday for the last three days.
If he continues like this he --- lose his job.
4. Imagine that your class has organized a variety show for the annual prize giving ceremony. Write a letter to a friend telling him or her about the things you will do.
5. Make a list of resolutions for the New Year. Mention some of the things you will do and will not do.
Must and can't are used to express certainty
He ate ten eggs at a time! He must be mad!
You must be joking! I don't believe you.
Must is used here to assert something that we infer or conclude to be the most logical possibility of a situation or an event. The negative of this use of must is can't, for example: My mark-sheet shows that I've failed in English. There must be some mistake. English has always been my strong subject! It simply can't be.
He can't be the owner of that house!
He's just a salesman in a furniture shop.
In the examples above, must expresses the logical al possibility (a mistake) of the situation (English being his strong subject). And then the logical possibility that he cannot have failed is expressed with 'It simply can't be.'
Now fill in the blanks in the following sentences with must or can't.
1. I think our neighbor is an airhostess. She ---- be. We have never seen her go anywhere.
2. All you read about in news papers now-a-days is crime, violence and death.
Things ---- continue like this. The government ----- do something to improve the law and order situation.
3. The baby has been crying without stopping. She -------- have a problem.
4. Have you noticed that the young man next door always leaves home at 9 at night and comes back home at around 7 next morning. Yes, I have. He ---- work night shift.
5. I think your friend Bikash has come. He's talking to Grandpa. It ---- be Bikash. He's in Chittagong now.
Must, must not and have to are used to express obligation, prohibition, and necessity.
The teacher says to her students, "You must submit your essay tomorrow. I won't accept any after that. And you must not copy your essay from any book or from any one else's writing."
Why are you leaving so early? Have another cup of tea. No, I can't, I have to pay the bills before going to office.
In the first example, must means necessity or obligation. And must not is used to mean prohibition. Must/must not in this sense usually has an authoritative tone.
Have to expresses obligation on the part of the speaker, and expresses the fact that something has to be done. The past tense of have to is had to. For example:
I left office fifteen minutes early yesterday as I had to pick up my son from his aunt's house.