4 sentences

1. 由此可知，他并没有说实话。

   yóu​cǐ kě​zhī, tā bìng méi​yǒu shuō shí​huà.

   From this, it is clear that he was not telling the truth.

   Source: Dong Chinese Dictionary

2. 他可能已经死了也未可知。

   tā kě​néng yǐ​jīng sǐ le yě wèi kě​zhī.

   He could be dead, for all I know.

   Source: OpenSubtitles

3. 汝等可知此举意味着什么，千万不可掉以轻心。

   rǔ děng kě​zhī cǐ jǔ yì​wèi zhe shén​me, qiān​wàn bù kě diào​yǐ​qīng​xīn.

   Do you all realize what this move signifies? You must not take it lightly under any circumstances.

   Source: Dong Chinese Dictionary

4. 这些规律在某种程度上是人类可知的。

   zhè​xiē guī​lǜ zài mǒu zhǒng chéng​dù shàng shì rén​lèi kě​zhī de.

   To some extent, these laws are knowable to humans.

   Source: Dong Chinese Dictionary