有一种说法:
1、主句中有如果do,except, but 后就不用to.
如:
Last night I did nothing but prepare my lessons.
昨天晚上,我什么也没做,只是在准备功课。
She can do everything except cook.
除了不烧饭,她什么事都做。
2、主句谓语动词不是do,而是其它动词(如have, be 等)的时候,except, but 后面就要接to.
如:
He seldom went anywhere except to the library.
除了去图书馆,他很少去其它地方。
It had no effect except to make him angry.
除了令他生气之外,没什么效果。
还有其他地方语法书上认为介词一般接动名词作宾语,但是 except, but, besides习惯上要动词不定式作宾语。
《朗文当代高级英语辞典》中有一条:
except to do something
He wouldn't talk about work, except to say that he was busy.
所以,这里应该填to watch
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