make the following sentences into negative and interrogative sentences.1. they were laughing at the joker 2. he was taking exam last month 3. you are waiting for him yesterday. 4. she was working in a factory 5. it was raining yesterday.

1. They were not laughing at the joker.
 Were they laughing at the joker?

2. He was not taking exam last month
Was he taking exam last month?

3. You were not waiting for him yesterday
Were you waiting for him yesterday?

4. She was not working in a factory.
Was she working in a factory?

5. It was not raining yesterday.
Was it raining yesterday?

^_^