know +sb/sth或者know+that從句，know后面一般不接不定式或者分詞作賓語，一般都是接that從句，that可省略。

know后面加doing還是todo

know加how to do可以,沒見過直接加to do sth.或doing sth一般是直接加名詞know 作 “見到過；聽到過”[一般用于過去時(shí)或完成時(shí)]：但不是固定know+to do sth 固定句型I've never known him to cry.我從未見過他哭泣.

think作謂語,一般也是加賓語或從句作“料想；猜想；相信”意,可以像下面那樣翻譯,但不是think + to do sth 的固定句型I didn't think to see my boss in the party.我沒想到會(huì)在聚會(huì)上見到我的老板.

know的例句

‘What's the answer?’ ‘I don't know.’

“答案是什么？”“我不知道。”

‘There's no one in.’ ‘ How do you know? ’

“里邊一個(gè)人都沒有。”“你怎么知道呢？”

You know about Amanda's baby, don't you?

你知道阿曼達(dá)的小寶寶吧？

I don't know about you, but I'm ready for something to eat.

不管你怎么樣，反正我要吃點(diǎn)東西。