do anything/nothing/everything but (except) 句型是很常见的不定式句型。
用法，如果前面的谓语动词是do nothing类型的，but后面就跟不带to 的 动词不定式。
如：Last night I did nothing but watch TV.
另外，如果前面的谓语动词不是do nothing的类型的动词， 则but后面的不定式就要加上to。
如 ：The doctor told him nothing but to stop smoking。
There was nothing for them to do but to remain silent.
The lost child desired nothing but to go home.