Question 1

Why is there a que after et instead of a second si?

Accepted Answer

In French, it is considered bad style to repeat si (if) when listing multiple conditions in a single sentence. Instead of saying et si l'écosystème..., you replace the second si with que.

Question 2

Why do we use the subjunctive puisse instead of the indicative peut here?

Accepted Answer

Even though the first condition uses the indicative mood (si tu purifies), when you substitute a subsequent si with que, French grammar requires the verb that follows to be in the subjunctive mood. That is why we use puisse.

Question 3

Could we just say que l'écosystème survive instead of using puisse?

Accepted Answer

Yes, you could. Using que l'écosystème survive would simply mean and the ecosystem survives. The author used puisse survivre to specifically capture the nuance of ability present in the English translation: and the ecosystem can survive.

Question 4

What type of conditional structure is being used for the main clause?

Accepted Answer

This is a standard First Conditional structure, which expresses a likely future outcome. The formula is si plus present tense (tu purifies), followed by a main clause in the future tense (nous pourrons). The inserted que clause just adds a second condition before we reach the main future result.

Si tu purifies l'eau et que l'écosystème puisse survivre, nous pourrons coloniser la région.

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