Sure, here are the sentences transformed into their negative forms and Yes/No questions, along with their answers:

2. He looked at the picture.
- Negative: He did not look at the picture.
- Yes/No Question: Did he look at the picture?
- Answer: Yes, he did. / No, he didn't.

3. They drank all the wine.
- Negative: They did not drink all the wine.
- Yes/No Question: Did they drink all the wine?
- Answer: Yes, they did. / No, they didn't.

4. Hoa wanted a cap.
- Negative: Hoa did not want a cap.
- Yes/No Question: Did Hoa want a cap?
- Answer: Yes, she did. / No, she didn't.

5. David went to school by bicycle yesterday.
- Negative: David did not go to school by bicycle yesterday.
- Yes/No Question: Did David go to school by bicycle yesterday?
- Answer: Yes, he did. / No, he didn't.

6. Harry arrived at 3 o'clock.
- Negative: Harry did not arrive at 3 o'clock.
- Yes/No Question: Did Harry arrive at 3 o'clock?
- Answer: Yes, he did. / No, he didn't.

7. Tom ate eggs for lunch.
- Negative: Tom did not eat eggs for lunch.
- Yes/No Question: Did Tom eat eggs for lunch?
- Answer: Yes, he did. / No, he didn't.