Cette chauve-souris, c'est non pas un oiseau, mais un mammifère.

Questions & Answers about Cette chauve-souris, c'est non pas un oiseau, mais un mammifère.

Why use non pas here instead of making the verb negative with n'est pas?
The structure non pas [A], mais [B] is used for emphatic correction. While ce n'est pas un oiseau, mais c'est un mammifère is grammatically correct and perfectly fine, using c'est non pas... strongly highlights the contrast. It explicitly shoots down a false assumption before providing the correct fact.
Why is the sentence structured as Cette chauve-souris, c'est... rather than simply Cette chauve-souris est...?
This is a very common spoken and informal structure in French. By stating the subject first (Cette chauve-souris) and then repeating it with a pronoun (c'est), you emphasize the topic. It translates roughly to "As for this bat, it is...".
Since chauve-souris is feminine, why do we use c'est instead of elle est?
The choice between c'est and elle est depends on what comes after the verb, not what the subject is. Because the verb is followed by a noun with an article (un oiseau / un mammifère), you must use c'est. You would only use elle est if it were followed by an adjective alone, like elle est nocturne.
How do I make chauve-souris plural if I want to talk about multiple bats?
It becomes des chauves-souris. Because it's a compound noun made of an adjective (chauve, meaning bald) and a noun (souris, meaning mouse), both parts need to be pluralized. Since souris already ends in an "s" in the singular, its spelling doesn't change, but chauve gets an "s".

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