3 sentences

1. 你知道，学校明天就开学了。

   nǐ zhī​dao, xué​xiào míng​tiān jiù kāi xué le.

   You know, school starts tomorrow.

   Source: OpenSubtitles

2. 你知道，学医有多么艰苦吗？

   nǐ zhī​dao, xué yī yǒu duō​me jiān​kǔ ma?

   Do you know how hard it is to study medicine?

   Source: CCMatrix

3. 不用说也知道，学习词汇是学习语言的一个主要部份。

   bù​yòng​shuō yě zhī​dao, xué​xí cí​huì shì xué​xí yǔ​yán de yī​ge zhǔ​yào bù​fèn.

   It goes without saying that studying vocabulary is a key part of language learning.

   Source: UM-Corpus: Education