He spent what he could buying the house和He did what he could to help me中could有什么区别?

题目

He spent what he could buying the house和He did what he could to help me中could有什么区别?
比如：He has got married for ten years就不行 要将got改成been

答案

第一句中的he could来修饰what,整个句子是spend...doing句型
第二句中的he could来修饰what,to help是一个表目的不定式
married是点动词,不能跟一段时间for ten years,而been是be动词可延