Ответ:

1) I'm writing

2) I was writing

3) is slipping

4) was slipping

5) aren't doing

6) were not doing

7) you are eating

8) was eating

1.I am writing an English exercise now.

2. I was writing an English execise at this time yesterday.

3. My little sister is sleeping now.

4. My little sister was sleeping at this time yesterday.

5. My friends aren't doing their homework now.

6. My friends weren't doing their homework at seven o'clock yesterday. They were playing volley-ball

7. Are you eating ice-cream now?

8. Were you eating ice-cream when I rang you up yesterday?

Отметь мой ответ как самыц лучший.