Пусть ответят те кто действительно знает :) ​

2)

1. am

2. had

3. doesn’t

4. will

5. were

6. have

7. don‘t

8. should ( выбрала из предложенных, можно перевести  «поезд должен прибыть». вообще правильно было бы просто arrives «поезд прибывает» когда речь идет о расписании, то используется Present Simple)

9. have

10. will

3.

1. Does he seem unfriendly?

2. When I came the typist was typing the letters.

3. The agreement has just been signed by the director.

4. He will be working when his mother returns.

можно и так:

His mother will be working when he returns.

5. Did you go to the cinema yesterday?

6. He had returned before I finished my work.

Объяснение: