按要求改写句子。

1. Will you please sing a song for us?（改为祈使句）

    ___________ a song for us.

2. You should take some medicine if you have a cold. （对画线部分提问）

    ___________ I ___________ if I have a cold?

3. He is riding a bike now.（用yesterday afternoon改写）

    He ___________ a bike ____________.

4. He did the laundry last night.（改为否定句）

    He ___________ the laundry last night.

5. She has a headache.（对画线部分提问）

    ____________ with her？