Here are the answers for the sentences where the verbs should be put into the correct form:
1. He **is** a good boy.
2. She **does not play** the piano well.
3. They **were** at school yesterday.
4. We **learned** to drive a car yesterday.
5. Mike **will not be** at home at 5 o'clock tomorrow.
6. Susan **comes** to work tomorrow.
7. She knew that he **was not** there on Monday.
8. He said that he **would watch** that movie the following day.
9. Vegetables **are bought** by her every day.
10. The homework **was not done** by him yesterday.
11. The guests **are introduced** tomorrow.
12. They said that the book **would be written** the following year.