He does not know whether they will plant trees on Saturday or not.

他不知道他们周六是否会去植树。

Anyone who does not know how to make the most of his luck has no right to complain if it passes by him.

不知道如何充分利用运气的人无权抱怨运气从他身边溜走。

Annie has just received a new camera for her birthday, but she does not know how to use it, and would like to learn more.

安妮刚收到一台新的生日相机，但她不知道如何使用，想学更多。

He does not know this secret.

他不知晓这个秘密。

He does not know about this plan.

他不知悉这个计划。

He maybe does not know the answer.

他不一定知道答案。

He does not know whither he has gone.

他不知道他到哪里去了。

She does not know the time of the meeting.

她不知情这次会议的时间。

She always does not know good from bad, not understanding to cherish others' goodwill.

她总是不知好歹，不懂得珍惜别人的好意。

He really does not know good from bad, others helped him but he still doesn't appreciate it.

他真是不知好歹，别人帮了他还不领情。