Since / now that with 既然…就…

Structure 既然 + given fact，就 + conclusion

既然…就… (jìrán… jiù…) starts from an ALREADY accepted fact to draw a logical conclusion: "since…, then…". 既然来了，就别走了 = "since you’re here, don’t leave". Unlike 因为 (which gives new cause), 既然 picks up something both already know. 就 opens the conclusion.

Examples

既jì然rán来lái了le，就jiù别bié走zǒu了le。
Since you’re here, don’t leave.
既jì然rán你nǐ不bù舒shū服fu，就jiù好hǎo好hǎo休xiū息xi。
Since you’re not well, get some good rest.
既jì然rán决jué定dìng了le，就jiù别bié后hòu悔huǐ。
Now that you’ve decided, don’t regret it.

Levels are indicative: they follow the standard Chinese Grammar Wiki (AllSet Learning) progression, not an official HSK 3.0 mapping. We never assign levels by eye.

This point and the other 370, with audio on every example, inside Wanyu.