the doctor did what he could to save it.为什么不是what he could do.还有to,can后能加to 请帮帮

问题描述:

the doctor did what he could to save it.为什么不是what he could do.还有to,can后能加to 请帮帮

did +what he could ,这是动宾结构,而且宾语是what引导的宾语从句,本来完整的应该是what he could do,但是因为前面有一个 did 所以就省略了do。
另外,to save it在这里是作目的状语,而不是你理解的can后加do..
你可以把句子断开来多读几遍,理解理解the doctor did what he could to save it。
把句子的结构弄清楚,不要把语法学得太死,多读一读练练语感,比死记语法有用很多
加油~~!!

what he could,插入语,can情态动词

医生做了他所能做的一切去救它.
TO表示目的(去救它),直接用原型就不包含这个意思了.
可以