既然……，就……
since / now that A (a fact both sides accept), B follows
Structure
既然 A ，（主语） 就 B
What it means
“Since, now that”: A is a fact both speakers already know or accept, and B draws a conclusion from it.
How it is built
既然 + A，(subject) + 就 + B: 既然你不舒服，就早一点儿回家吧 (since you’re unwell, go home early). With a subject: 既然大家都同意，我们就这么决定吧.
When to use it
B is often a suggestion with 吧, an order or a question. 因为 gives a reason; 既然 starts from a shared fact and draws a conclusion, so it cannot answer “why?”.
Watch out
就 goes after the subject of the second half, never before it: ✗ 既然医生让你别抽，就你别抽了。 ✓ ……，你就别抽了。 To answer 为什么, use 因为, not 既然.
Examples
既然你不舒服，就早一点儿回家吧。
Since you’re not feeling well, go home early.
既然医生让你别抽，你就别抽了。
Since the doctor has told you not to smoke, stop.
既然大家都同意，我们就这么决定吧。
Since everyone agrees, let’s settle it like that.
Learn this in HSK 4 · Lesson 10: 别再抽烟了 (Giving up smoking)
A dialogue, a reading, word cards with audio and a drill that uses it, in Learn Chinese with Bao. The first lessons of every level are free.
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