Since that is so: 既然…就…
Take a fact both speakers already accept and draw the obvious conclusion from it. The first clause must be known to be true; the second, usually a suggestion or decision, carries 就.
Structure
既然 + 已知事实，（主语）+ 就 + 结论／建议
Explanation
Chinese words in this text can be activated to show a dictionary gloss.
， “Since you’re not feeling well, go home early and rest.” takes something that is already established — the listener has just said it, or both of you can see it — and uses it as the ground for what follows.
That is the whole difference from . supposes; accepts. You cannot use for something that has not happened or is not known: is wrong, because nobody yet knows whether it will rain. Say instead. When the fact is in hand, though, is often the more natural choice, because it signals that you are reasoning from the other person’s own position: ， “Since everyone agrees, let’s do it this way.”
The second clause carries , after its subject if it has one: ，. It is very often a suggestion with , a decision, or a challenge with : ，？ “If you know it’s wrong, why are you still doing it?” does not pair with — the relationship is “given this, then”, not “because of this, therefore”.
Correct
Say each one out loud before moving on. The audio is a reference pronunciation, not a model to imitate exactly — match the tone contour, not the voice.
既然你不舒服，就早点儿回家休息吧。既然你不舒服，就早點兒回家休息吧。
Jìrán (fourth tone, falling) nǐ (third tone, dipping) bù (fourth tone, falling) shūfu, (first tone, high and level) jiù (fourth tone, falling) zǎo (third tone, dipping) diǎnr (third tone, dipping) huí (second tone, rising) jiā (first tone, high and level) xiūxi (first tone, high and level) ba. (neutral tone)···
Since you’re not feeling well, go home early and rest.
既然已经决定了，我们就别再讨论了。既然已經決定了，我們就別再討論了。
Jìrán (fourth tone, falling) yǐjīng (third tone, dipping) juédìng (second tone, rising) le, (neutral tone) wǒmen (third tone, dipping) jiù (fourth tone, falling) bié (second tone, rising) zài (fourth tone, falling) tǎolùn (third tone, dipping) le. (neutral tone)···
Since it’s already been decided, let’s stop discussing it.
既然你喜欢这件衣服，就买吧。既然你喜歡這件衣服，就買吧。
Jìrán (fourth tone, falling) nǐ (third tone, dipping) xǐhuan (third tone, dipping) zhè (fourth tone, falling) jiàn (fourth tone, falling) yīfu, (first tone, high and level) jiù (fourth tone, falling) mǎi (third tone, dipping) ba. (neutral tone)···
Since you like this jacket, buy it.
Incorrect — Common mistakes
These sentences are wrong. They are printed here on purpose, each one paired with the repair and the reason, because the error you can recognise is the error you stop making.
Not quite
Incorrect sentence: 既然明天下雨，我们就不去爬山了。
Correct
Correct sentence: 如果明天下雨，我们就不去爬山了。
Why: Tomorrow’s weather is not yet a fact, so it cannot be granted with 既然. A supposition takes 如果.
Not quite
Incorrect sentence: 既然你累了，所以休息吧。
Correct
Correct sentence: 既然你累了，就休息吧。
Why: 既然 pairs with 就, not 所以. The second clause draws a conclusion; it does not report a result.
Not quite
Incorrect sentence: 既然你累了，就你休息吧。
Correct
Correct sentence: 既然你累了，你就休息吧。
Why: 就 is an adverb: when the second clause has a subject, 就 comes after it.
Compared with
Most errors with this pattern are not errors about this pattern — they are a neighbouring pattern arriving at the wrong moment. Read these side by side.
因为…所以… reports why something happened: 因为他病了，所以没来上课 “He was ill, so he missed class.” 既然…就… takes a fact the listener already accepts and argues from it, usually towards a suggestion or decision: 既然你病了，就别来上课了 “Since you’re ill, don’t come to class.” A useful check: if the second clause tells someone what to do, or asks why they are still doing something, it wants 既然; if it simply states a consequence, it wants 因为…所以….
Cause and result: 因为…所以… →Mini quiz
Question 1 / 3Total score: 0
Choose the word that completes ___你已经知道了，我就不说了。