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1. Give the Past Simple Tense:

  1. He can speak English quite well.

  2. He is to be at home at 7 o'clock.

  3. She has to work at home today.

  4. They must be very attentive at the lessons.

2. Complete the following sentences according to the models:

Model I: I have missed many lessons and now I have to work very hard.

The results of their experiments were bad, they had to repeat them.

  1. He has worked very hard this month, he ... a little now.

  2. This substance is very dirty, if you want to use it, you . . . before the experi­ment.

  3. They used analytical balances as they . . . very minute quanti­ties.

  4. The water is very cold, you . . . before drinking it.

Model II: I cannot attend the lecture as I am to be at home at six.

  1. Don't be late, the meeting ... at five sharp.

  2. He ... his re­search work by the end of this year, that's why he is so busy.

  3. The tem­perature ... to 100°C if you want to finish your experiment in time.

  4. Don't you know that she ... at three, it will take her an hour to get here.

3. Fill in the blanks with to have to or to be to:

  1. I can't go with them as I ... (to be) at the Institute at half past nine.

  2. If you want to understand this phenomenon better you . . . (to look through) some articles devoted to this problem.

  3. As this question is not solved the meeting ... (to be put off).

  4. At ten a.m. he ... (to make a report), I think it will be interesting to listen to him.

  5. As he made many mistakes in his last work he ... (to rewrite) it.

4. Use can or be able to. Sometimes it is possible to use either; sometimes only be able to is possible.

Model: George has travelled a lot. He can (or is able to) speak four languages. I haven't been able to sleep very well recently.

  1. Tom ... drive but he hasn't got a car.

  2. I can't understand Martin. I've never ... understand him.

  3. I used to ... stand on my head but I can't do it now.

  4. Ask Ann about your problem. She should ... help you.

5. Complete the sentence with could.

Model: I can't sing now but I could sing very well when I was a child.

1. He can't play tennis very well now but he ... quite well when he was younger.

2. She can't run very fast now but when she was at school she ... faster than anyone else.

3. I can't swim very far these days but ten years ago I ... from one side of the lake to the other.

6. Complete a sentence with could, was/were able to or couldn't.

Model: My grandfather was very clever. He could (or was able to) speak five languages.

I looked everywhere for the book but I couldn’t find it.

The fire spread quickly but everyone was able to escape.

  1. He had hurt his leg, so he ... walk very well.

  2. She wasn't at home when I phoned but I ... contact her at her office.

  3. I looked very carefully and I ... see a figure in the distance.

  4. They didn't have any tomatoes in the first shop I went to, but I ... get some in the next shop.

  1. My grandmother loved music. She ... play the piano very well.

  2. The boy fell into the river but fortunately we ... rescue him.