根据括号内的要求转换句型。

1．Li Lei is writing a letter．（就划线部分提问）

2．Daming is going to buy some clothes on his birthday．（就划线部分提问）

3．He is going to play basketball tomorrow．（改为否定句）

4．Students will study at home．（改为一般疑问句）

5．My father is older than my mother．（同义句）

My mother is ____________ my father．