1. I can’t/am not able to answer this question.
2. When I was three I could/was able to understand what I was told.
3. I can/am able to call you tomorrow.
4. Could you/Are you able to answer the phone, please?
5. My sister can’t/isn’t able to sing but she can/is able to dance.
6. I can/will be able to perform this trick in two weeks.
7. The fireman could/was able to save the cat.
8. I can’t/couldn’t visit you this week.
9. Can/Could you speak German?
10. The doctor is free. He can/is able to examine you.

1)Billy usually sits near the window,but now he is sitting in front of the teacher. 
2)The Smiths always spend their holidays at the seaside. They are on holiday now. They are at the seaside .
3)Sorry I can't play with you now because I am doing my homework.
4)The teacher opened the door and asked -Boys,what are you doing? We are learning the new worlds.Then why are you sitting under the desk? Because we are looking for a pen.- Are you ready to write a test?- Yes,we are.
5)Can I use your red pen,please? - Sorry,I am using it now.
6)I never use the calculator at school.
7)Can you help me,please . I am trying to turn on the computer.
8)Every day my mother  tries to teach my little brother how to do morning exercises.
9)The sun is shining brightly,lets have lunch in the garden.
10)The sun shines brightly in August.

2) We were caught in a thunderstorm, so we sheltered in...

3) English is spoken almost everywhere.

4) School uniforms are not worn in..

5) The house was build some..

6) My dress was made in Turkey, but I bought it ...

7) The operation was performed by...

8) Plums are picked up..

9) Computers are used at..

10) A nice present was given to..

Объяснение:

Present Passive - am/is/are+ глагол с окончанием ed ( если он правильный), если неправильный - третья колонка таблицы неправильных глаголов

Past Passive - was/were ed + с глаголами то же самое , что и в предыдущем.