but to do 和but do 的区别
在这些动词do(does/did/done /doing/to do)在but, except, save, than, as等词后,这条规则同样适用。例如:
He did nothing but laugh.
他只是笑。
What could he do but take back what he had said?
他除了收回他说的话以外,还有别的什么办法?
当but前的谓语结构是do时,或者定语从句中有do时,but后面不用to
There is nothing to do but stay here.
I have no choice but to stay here.