HSK 5 · VERSION 2.0#57
Expressing Cause / Emphasis with “zhī suǒyǐ... shì yīnwèi / shì wèile / shì xiǎng...”
之所以……是因为 / 是为了 / 是想……
How it works
This pattern gives an explicit explanation of the reason or purpose behind a situation. In natural English, it often corresponds to:
the reason... is that...
... because...
... in order to...
It is common in formal explanation and argumentative writing.
The pattern
之所以 (zhī suǒyǐ) + Result / Situation + 是因为 (shì yīnwèi) / 是为了 (shì wèile) / 是想 (shì xiǎng) + Reason / Purpose
Example sentences
他之所以一直没有回答，是因为他想先把情况弄清楚。
He had not answered because he first wanted to understand the situation clearly.
我们今天提前开会，之所以这样安排，是为了让大家有更多时间准备。
We scheduled today’s meeting earlier to give everyone more time to prepare.
他之所以坚持要去，是想亲自了解事情的经过。
He insisted on going because he wanted to learn firsthand what had happened.
Key point
This structure is more formal and more explicit than just using 因为 (yīnwèi).