We couldn’t use the tape-recorder, they were repairing it....

in passive voice

We couldn’t use the tape-recorder, it was being repaired.

Объяснение:

1.  Everything had been done before he came.

2. The letter had already been sent.

3. He had been informed of the news before .

4. Some new Metro lines are being constructed now.

5. Wait a little. The last students are being examined there.

6. The tape-recorder couldn't be used, it is being repaired.

7. A very interesting program was being broadcast.

8. He has not been told about it yet.

9. Her face was hidden by the branches of the tree.

10. I was taken there by his brother more than once.

11. I am surethey will be pleased with your presence.

12. I was informed about it only yesterday.

13. She was listened to very attentively.

14.This little boy was taken no notice of .

15 . The letter hasn't been sent  yet.

16. English is spoken in different parts of the world.

17. Milk is used for making butter .

18. I'm often invited to their parties.

19. A lot of new houses are built in this district every year .

20. When was this new house built?

москва это столица огроманой державы россии.

москва это огромный мегаполис, полный достопримичательностей.

бывшая столица самой большой в мире страны .

в москве находится известные на весь мир собор василия блаженого , казанский собор, мовзолей ленина.

москва это культурный город, с большим количеством известных музеев. 

прекрасный врач.

чёрный грач.

горечь в горле.

золотая молодёжь.

потерянный ключ.

торжественный марш.

меч в камне.

верный муж.