Сделать предложение в отрицательной did , вопросительной- who- where-when- how long?

1. He spent two months in Moscow last year.

2. He didn\'t spend two months in Moscow last year.

3. Who spent two months in Moscow last year?

4. Where did he spend two months last yeat?

5. When did he spend two months last year?

6. How long did he stay in Moscow last year?