1704942830
1704942831
How long have you known her？你认识她有多久了？
1704942832
1704942833
He knew London very well．他对伦敦很熟悉。
1704942834
1704942835
I don’t know much about astronomy．我对天文学不太了解。
1704942836
1704942837
它后面可以跟从句：
1704942838
1704942839
I knew she was against us．我知道她是反对我们的。
1704942840
1704942841
I didn’t know you were coming today．我不知道你今天会来。
1704942842
1704942843
She was curious to know where we had been．她很想知道我们到哪里去了。
1704942844
1704942845
We don’t know whether you like flowers．我们不知道你喜不喜欢花。
1704942846
1704942847
也可以跟“连接副词（代词）＋不定式”：
1704942848
1704942849
Do you know how to type？你会打字吗？
1704942850
1704942851
You know where to get in touch with them？你知道在哪里和他们联系吗？
1704942852
1704942853
I don’t know what to do about it．我不知道该把它怎么办。
1704942854
1704942855
She did not know who to ask advice from．她不知道该向谁请教。
1704942856
1704942857
有时可跟复合结构（不定式可带to，也可不带to，但在被动结构中需加to）：
1704942858
1704942859
I have never known her to tell lies．我从未听说她撒过谎。
1704942860
1704942861
Have you ever known her lose her temper？你曾听说她发过脾气吗？
1704942862
1704942863
No serious injuries were known to have occurred．未听说有人受重伤。
1704942864
1704942865
He was known to be a dangerous criminal．大家知道他是一个危险的囚犯。
1704942866
1704942867
I know this to be a fact．我知道这是事实。（不定式为be时to不能省略。）
1704942868
1704942869
这种结构比较文气，在口语中用从句更自然一些：
1704942870
1704942871
I know this is a fact．
1704942872
1704942873
It’s known no serious injuries have occurred.
1704942874
1704942875
We knew that he was a dangerous criminal.
1704942876
1704942877
know后面也可以不跟宾语：
1704942878
1704942879
“His father came here yesterday.” “Yes, I know.”
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