Sure, here are the sentences converted into negative and interrogative forms:

1. He plays golf on Sundays.
- Negative: He does not play golf on Sundays.
- Interrogative: Does he play golf on Sundays?

2. The weather is bad in November.
- Negative: The weather is not bad in November.
- Interrogative: Is the weather bad in November?

3. We have fish for dinner.
- Negative: We do not have fish for dinner.
- Interrogative: Do we have fish for dinner?

4. Peter gets up before seven.
- Negative: Peter does not get up before seven.
- Interrogative: Does Peter get up before seven?

5. They watch TV in the afternoon.
- Negative: They do not watch TV in the afternoon.
- Interrogative: Do they watch TV in the afternoon?