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1·Who knows what changes tomorrow may bring?

谁知道将来会有什么变化？《牛津词典》

2·Who knows how to plant trees?

谁知道如何种树？

3·Who knows? Perhaps you could be another Severn.

谁知道呢？也许你可以成为另一个珊文。

4·Who knows, but there's one thing I am sure: she hasn't written a best-selling book yet.

谁知道呢，但有一件事我很确定：她还没有写出畅销书。

5·Who knows who is who?

谁知道谁是谁？

6·It suddenly occurred to her, Who knows?

她突然想到：“谁会知道呢？”

7·Who knows, but his reindeer must be very fit.

天知道，但是圣诞老人的驯鹿绝对是非常强壮的。

8·Who knows the answer? Please put your hands up.

谁知道答案？请举手。

9·Who knows?

谁知道？

10·But he who knows he knows nothing knows something.

但是知道他不知道这件事的人是知道一些事情的。