按要求改写句子。

1. Mr. Wood teaches us math. (改为一般疑问句)

    ____________ Mr. Wood ____________ us math?

2. I have a yellow dress. (改为否定句)

    I ____________ ____________ ____________ yellow dress.

3. There is a man and a child. (改为复数形式)

    There ____________ ____________ and ____________.