All i could do is to wait.的主语是"I could do''吗

All i could do is to wait.的主语是"I could do''吗
All i could do is to wait.的主语是"I could do''吗

All i could do is to wait.的主语是"I could do''吗
all是主语,其后省略 that 紧跟i could do是用来修饰all的.意思是我所能够做的一切就是等待.

ALL i could do