题目内容：

Ben wants to make a birthday card for his mother.对划线部分提问
划线部分是make a birthday card for his mother

优质解答

What does Ben want to do for his mother?
转换过程：
原句 ->
Does Ben want to make a birthday card for his mother? ->
Does Ben want to for his mother? ->
What does Ben want to do for his mother?