Ответ:

1. I have found a big piece of amber on the shore of the Baltic Sea.

2. Who sells ice-cream?

3. I am writing sentences right now.

4. Peter doesn’t speak German at all.

5. Mary stayed at home all day yesterday.

6. Please,don’t put my things away!

7. My parents don’t like to play computer games.

8. We should visit our grandparents on Saturday.