but to do 和but do 的用法不同，前面動(dòng)詞是do（does/did/done /doing/to do）時(shí)，后接不帶to的原形不定式；如前面用的是其他的動(dòng)詞，則后面的不定式要加上to。But可以用于連接句子，也可以用在句首。

This isn’t a good one but it will answer.這不太好，但可以將就用。

He looks honest, but actually he’s a rogue.他看起來(lái)很老實(shí)，實(shí)際他是一個(gè)壞蛋。

She has had no answer to him but he gave no answer.我向他說(shuō)了早上好，但他沒(méi)有回應(yīng)。

But that question doesn’t arise.但沒(méi)發(fā)生那個(gè)問(wèn)題。

But in secret she was delighted.但她暗中感到高興。

But what else can we do?我們還能做什么?

He eats nothing but hamburgers.他只吃漢堡包。

She knows no one but you.她只認(rèn)識(shí)你。

You have nobody but yourself to blame.只能怪你自己。