按要求改写下列各句，每空一词 。

1. That’s my mother. (改为一般疑问句)

________ that ________ mother?

2. This is her brother. （改为复数句子）

________ ________ their brothers.

3. Thanks very much. （改为同义句）

________ ________ very much.

4. He is my son. （对画线部分提问）

________ ________ he?

5. They are girls. （改为单数句子）

________ ________ ________ ________.