not that I know of 

used when answering a question to mean that, judging from the information you have, the answer is no

據(jù)我所知并非如此，據(jù)我所知沒有

A: Is she especially unhappy at school?

她在學(xué)校特別不高興嗎?

B: Not that I know of.

據(jù)我所知沒有。

A: Are you going to Washington next month?

你下個月要去華盛頓嗎?

B: Not that I know of.

沒這回事。

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