Ответ:
1. What are you doing here? I'm waiting for a friend.
2. Does he speak French? Yes, he speaks French well.
3. Someone is knocking at the door.
4. The students are writing a dictation there.
5. The man who is reading a book is our English teacher.
6. Let's go for a walk. It isn't raining.
7. He is looking for his key.
8. He is doing his homework.
8. We usually watch TV One but tonight we are watching TV Two for a change.
10. Sam is playing ball.