L'alpiniste avait préparé l'ascension, mais il était très fatigué.

From Lesson 325:However (si... que)·French

Questions & Answers about L'alpiniste avait préparé l'ascension, mais il était très fatigué.

How could I apply this lesson's target structure (si + adjective + que) to this sentence?
You could rewrite it to emphasize the concession: Si fatigué qu'il ait été, l'alpiniste avait préparé l'ascension (However tired he may have been, the mountaineer had prepared the ascent). We use the past subjunctive (ait été) here because his state of fatigue was in the past.
Why do we use the pluperfect (avait préparé) for the first verb, but the imperfect (était) for the second?
This creates a clear timeline. The pluperfect (avait préparé) shows that the preparation was fully completed before the main timeframe of the story. The imperfect (était) describes his ongoing physical state (being tired) as a background detail during that past timeframe.
How do we know the gender of L'alpiniste since the article is contracted?
We know the mountaineer is male because of the pronoun il in the second half of the sentence. The noun alpiniste ends in an -e, so its spelling stays exactly the same for both men and women. If this were a female mountaineer, the sentence would end with mais elle était très fatiguée.
Could I use la montée instead of l'ascension here?
You could, but l'ascension is much more precise for mountaineering. While la montée is a general word for a climb, an upward slope, or a hike, l'ascension specifically refers to a major, challenging expedition to reach a summit.

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