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Si-sentences: all the cases

si + …	main clause	meaning	example
present	present, future or imperative	real condition	Si tu as faim, mange. (If you're hungry, eat.) Si tu viens, on ira au lac. (If you come, we'll go to the lake.)
passé composé	present, future or imperative	condition already met	Si tu as fini, tu peux partir. (If you've finished, you can go.)
imparfait	present conditional	unreal now	Si j'avais une voiture, je viendrais. (If I had a car, I would come.)
plus-que-parfait	past conditional	unreal in the past	Si j'avais su, je serais venu. (If I had known, I would have come.)
plus-que-parfait	present conditional	past → result today	Si j'avais pris le train, je serais déjà là. (If I had taken the train, I'd already be there.)

The golden rule: never a future or conditional right after « si » when si means "if / on condition that". « Si j'aurais » is a mistake (like "if I would have").

But si has other meanings:

si = whether (indirect question) → any tense: Je me demande s'il viendra. (I wonder whether he'll come.) Je ne sais pas si elle accepterait. (I don't know if she would accept.)
si + imparfait alone = suggestion: Si on allait au cinéma ? (How about going to the cinema?)
si = so: Il est si gentil ! (He's so kind!)
Si ! = yes, after a negative question: Tu ne viens pas ? — Si, je viens ! (Aren't you coming? — Yes, I am!)
même si (even if) + indicative: Même s'il pleut, je sors. (Even if it rains, I'll go out.) comme si (as if) + imparfait: Il parle comme s'il savait tout. (He talks as if he knew everything.)

Elision: si + il(s) → s'il(s), but si elle, si on (no elision).

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