他并不知道。

He really didn't know.

《新英汉大辞典》

他并不知道其中另外一半的意思。

He did not know the half of it.

youdao

他并不知道挪威海择虾是什么。

He didn't really know what scampi was.

youdao

The difficulty with reading Machiavelli today is that we all think we already know what he knows and that is false.

今日阅读马奇亚维利的困难点,在于我们都认为我们早已知道,他所知道的东西，但那并不正确。

耶鲁公开课 - 政治哲学导论课程节选

But if he was innocent, he didn't know that she was a married woman, "the seignor shall prosecute his wife, treating her as he thinks fit."

但如果他是无罪的，并不知道她是某人的妻子，“某人则应以誓言揭发自己的妻子，并且可以任意对待她“

耶鲁公开课 - 旧约导论课程节选

He wasn't planning on dying.

他并不知道他自己会死

耶鲁公开课 - 聆听音乐课程节选