Question 1

Doesn't si usually mean "if" or "so"? How do I know it means "however" here?

Accepted Answer

You can tell by the unique grammatical structure! When you see si followed immediately by an adjective (like fatigué), then que, and finally a verb in the subjunctive (soit), it forms a set phrase indicating concession. Together, this specific combination translates to "however [adjective]" or "no matter how [adjective]".

Question 2

Why do we use the subjunctive soit instead of the indicative est?

Accepted Answer

Concessive phrases like si [adjective] que always trigger the subjunctive in French. This is because the sentence is setting up a theoretical extreme ("no matter what the degree of his tiredness might be") to emphasize that this condition still won't stop the main action of reaching the camp.

Question 3

Could I use another word instead of si to express this?

Accepted Answer

Yes, you can use aussi or pour to create the exact same meaning. Aussi fatigué qu'il soit and Pour fatigué qu'il soit are both perfectly valid and common alternatives to express "However tired he may be".

Question 4

Does the adjective fatigué still need to agree with the subject in this structure?

Accepted Answer

Absolutely. Even though it is sandwiched inside this si... que structure, the adjective is still describing the subject (il / l'alpiniste). If the sentence were about a female mountaineer, you would add an e: Si fatiguée qu'elle soit. If it were plural, it would be Si fatigués qu'ils soient.

Si fatigué qu'il soit, l'alpiniste va atteindre le camp.

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