The doctor did all he could to save the wounded boy.这句话语法上有错误吗?是不是应该在he could后面加个do呢?

The doctor did all he could to save the wounded boy.这句话语法上有错误吗?是不是应该在he could后面加个do呢?
The doctor did all he could to save the wounded boy.这句话语法上有错误吗?
是不是应该在he could后面加个do呢?

The doctor did all he could to save the wounded boy.这句话语法上有错误吗?是不是应该在he could后面加个do呢?
do 可用可不用,to save表目的；类似all 可用everything或what代替.换成what后宾语从句.

不用 因为前面已经有了did，为避免重复，所以不用

是的，应该要加个do
The doctor did all （that）he could do to save the wounded boy,that可以省略
或者可以这样表达，
The doctor did what he could do to save the wounded boy.
希望能帮到你，望采纳！

不用加do，这个是did谓语前置，倒装句all后面也省略了that

do all one can (do) 意为“尽力”，短语中的do可以省略。提问中的那句话在语法上是正确的。

原句正确无需加do ltzxyx 的回答正确“to save表目的”。这是一类固定句型，记住就好，灵活应用。