4.1 (write) letters home once a week, but i (not write) one this week, so my next letter must be rather long. 5. no wonder she (look) tired after the strain under which she (be) for a month. 6. why you (not shave) this morning? — i (shave) every other day. 7. research (show) that lots of people (absorb) new information more efficiently at some times of day than at others. a biological rhythm (affect) different people in different ways. 8.1 just (look) at the barometer and (see) that it (fall) very quickly. 9. don't shout so loudly. father (not finish) work and he hates if anybody (make a noise) while he (work 10.1 regularly (see) him at the tram stop, but i (not see) him these two or three days.

Write

Haven't written

Looks

Has been

Haven't shaved

Shave

Shows

Adsorb

Affects

Have looked

Have seen

Is falling

Hasn't finished

Makes

Is working

See

Am not seeing

Удачи)

4.1 write) letters home once a week, but I have not written one this week, so my next letter must be rather long. 5. No wonder she looks tired after the strain under which she has been for a month. 6. Why you have not shaved this morning? — I

shaved every other day. 7. Research (shows that lots of people (absorbed new information more efficiently at some times of day than at others. A biological rhythm (affects different people in different ways. 8.1 just have looked at the barometer and have seen that it is falling) very quickly. 9. Don't shout so loudly. Father has not finished) work and he hates if anybody (makes a noise) while he is working). 10.1 regularly (see him at the tram stop, but I am not seeing him these two or three days.

 When I came in the lecture had already started. Had the lecture started when I came in?
2. They had already translated this text when the bell rang. Had they translated this text when the bell rang?
3. When I came he hadn't left yet. Hadn't he left when I came?
4. When we came to the airport, the plane had already landed.  Had the plane landed when we came to the airport?
5. He suddenly understood that he had travelled in the wrong direction. Had he travelled in the wrong direction?

1) You have already sung merry songs at our Music lesson. Have you already sung merry songs at our Music lesson?
2) My friend and I have been watching educational film at our lessons for 20 minutes. Have my friend and I watched educational film at our lessons?. 
3) We haven't relaxed at the breaks between our lessons. Haven't we relaxed at the breaks between our lessons. 
4) They haven't learnt a poem by heart at our Literature lesson yet. Haven't they learnt a poem by heart at our Literature lesson?
5) We have already written tests. Have we written tests yet?

A. 1. I can read English, but I can not write. 2. I can not answer this question. 3. Now can you speak a little French? - Yes, I can do a little. 4. He can not walk much. 5. The boy was five years old, but he could skate. 6. Could you translate this text? - Yes, I could. 7. Tom could not do it last week. 8. I could only see the picture on the wall. 9. We can have lunch with me. 10. Can you tell me about this? - No I can not. 11.Who can open the door? 12. 12. I could not go to the theater yesterday, I did not have time. 13. You can smoke here. Can you give me this book? - I'm afraid not. 15. Can I have some tea? 16. Can I ask you a question? - Of course. 17. Tomorrow you can take this magazine. 18. Please tell me how to get to Pushkinskaya Street. 19. What can I do for you? 20. Can I leave a briefcase here? - I think yes.

B. 1. I can not do this job right now, I do not have time. 2. I can not eat lunch with you now. I'm translating an article. 3. Could you go to the theater last night? 4. He could come to us last week. 5. I could see this street very well. 6. She could not write a letter to us. 7. We could not discuss this issue on Monday. 8. Kolya was able to send a telegram only in the evening. 9. We were able to talk with these students after class. 10. I can start work tomorrow morning. 11. He can only get there in the evening. 12. Will you be able to translate these articles tomorrow? 13. Will he be able to meet these engineers at five o'clock? 14. She will not be able to finish this work tomorrow. 15. He will not be able to read these books on time. He does not have time. Надеюсь верно перевёл