ut：在这里作介词,常与nothing,nobody,who,all等连用,意为“除……之外”.后接不定式：He wanted nothing but to stay here for another day.他只是想在这再呆一天.
I have no choice but to tell you the truth.我只有告诉你实话.
There was nothing to do but (to) wait till help came.只有等待救援了.
请注意（必须牢记）：如果谓语动词为实意动词do的某种形式时,but 后的不定式要省略符号to.如：I can do nothing but let him know.我只能通知她.They did nothing but complain.他们只是抱怨.
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