既然…就 expresses a logical consequence from an established fact. The first part (既然) presents something accepted as true, and the second part (就) draws a conclusion.
Logical reasoning - Drawing conclusions from facts
Persuasion - Convincing someone based on accepted premises
Decision making - Acting on acknowledged circumstances
Since you don''t want to go, then don''t go.
既然 is always placed before the subject or at the start of the clause.
既然 = since (given that)
- 既然来了，就吃吧 (Since you're here, eat)
就 often follows in result clause
- 既然...就/那就...
For logical conclusions from facts
Since you don't want to go, then don't go.
Since you're here, then stay a while longer.
Since you've already decided, then don't regret it.
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