Breakdown of Le chat rusé ne pensait pas que l'oiseau fût si naïf.
être
to be
le chat
the cat
ne
not (used before the verb)
pas
not (used after the verb)
penser
to think
l'oiseau
the bird (m)
que
that (introducing a clause)
si
so (before an adjective/adverb)
rusé
cunning
naïf
naive
Questions & Answers about Le chat rusé ne pensait pas que l'oiseau fût si naïf.
Why is fût used here instead of the present subjunctive soit or the indicative était?
fût is the imperfect subjunctive (subjonctif imparfait) of the verb être. We need a subjunctive mood here because ne pensait pas que expresses doubt. Because the main verb (pensait) is in a past tense, formal and literary French uses the imperfect subjunctive to match the past timeline, rather than the present subjunctive soit. In everyday spoken French, however, people would usually just use soit.
How can I easily tell that fût is the imperfect subjunctive and not the passé simple?
The circumflex accent (the little hat over the û) is your biggest clue. The 3rd person singular passé simple of être is fut (no accent). The imperfect subjunctive always adds that circumflex in the il/elle/on form, making it fût.
Wait, doesn't the verb penser normally take the indicative?
Yes! When affirmative, verbs of thinking and believing (like penser and croire) express a perceived fact and take the indicative. But when you make them negative or turn them into a question, they express doubt or uncertainty, which triggers the subjunctive. This is why the sentence cannot use était.
Why does si translate to "so" instead of "if" in this sentence?
When si is placed directly in front of an adjective (like naïf) or an adverb, it acts as an intensifier meaning "so". It generally only translates to "if" when it introduces a full conditional clause with a subject and verb, like s'il vient (if he comes).
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