1.
1. The children cannot carry this box: it is too heavy.
2. You need to work hard at your English.
3. It was Sunday yesterday and we didn't have to go to work.
4. I must to wait for her at the station.
5. She needn't to send a telegram because it was too late to send a letter.
6. I couldn't understand what he said.
7. When her arm is better she is able to play the piano again.
8. The children were allowed to watch TV last night.
9. Nick was to write to hers for she will be here tomorrow.
10. May I see your garden, please?
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2.
1. was reading
2. is eating
3. will be doing
4. was watching
5. was playing
6. will be walking
7. will be having
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4.
1. I was offered an interesting job yesterday.
2. The plan will be discussed at tomorrow's meeting.
3. The road is still repaired.
4. Many new buildings were built in our town lately.
5. The post is delivered every morning.
6. Drinks are not served here after midnight.
7. The car was repaired the whole day yesterday.
8. By 5 o'clock the experiment will be completed.
9. The documents will be typed by the time the boss returns.
10. A new stadium was built opposite our house last year.