Le requin est non pas un mammifère, mais un gros poisson.

Questions & Answers about Le requin est non pas un mammifère, mais un gros poisson.

Why use non pas instead of just n'est pas?
non pas... mais... is used for strong, emphatic correction. It highlights the contrast between the false assumption (un mammifère) and the truth (un gros poisson). While Le requin n'est pas un mammifère, mais... is grammatically correct, using non pas gives it that punchy 'not X, but rather Y' emphasis.
Notice how there is no ne before est. Why is that?
Here, non pas is negating the noun phrase (un mammifère) directly, rather than negating the verb (est). The verb remains affirmative: 'The shark IS [not a mammal]...'. If you wanted to negate the verb, you would have to use n'est pas, but non pas is perfect for this kind of direct side-by-side contrast without making the whole clause negative.
Why does the adjective gros come before poisson instead of after?
gros (big/fat) is one of the common short adjectives that goes before the noun. A helpful refresher is the BAGS acronym, which stands for Beauty, Age, Goodness, and Size. Since gros describes size, it precedes the noun, unlike most French adjectives which follow it.
Why does the sentence use the singular Le requin to talk about sharks in general?
In French, you must use a definite article (le, la, or les) when making general statements about a category or species. You can use the singular (Le requin est... meaning 'The shark as a species is...') or the plural (Les requins sont... meaning 'Sharks are...'), but you cannot drop the article entirely like we sometimes do in English.

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