The doctor did all he could to save the wounded boy.这句话语法上有错误吗?
问题描述：
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?
答
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.