La sentinelle vient de crier, elle aura peur.

Questions & Answers about La sentinelle vient de crier, elle aura peur.

Why is aura (future tense) translated as "must be" (present tense) here?
This is the "futur de probabilité" (future of probability) taught in this lesson. In French, you can use the future tense to express a strong assumption or deduction about something happening right now. The speaker hears the yell and guesses the current reason. In English, we naturally express this present assumption with "must be".
Why is it aura peur instead of sera peur?
To say "to be afraid" in French, you use the expression avoir peur (literally "to have fear"). Since we are using the future of probability, the verb avoir is put into the future tense, becoming aura peur. You cannot use être here.
If the sentry is a man, would it change to le sentinelle and il aura peur?
No, une sentinelle is always a feminine noun, regardless of the actual gender of the person standing guard. Because the noun is grammatically feminine, the pronoun replacing it must also be feminine (elle), even if the soldier is male.
How does the phrase vient de crier fit into this assumption?
Venir de followed by an infinitive is the recent past, meaning "has just yelled." The sentence contrasts a confirmed, completed fact (the sentry just yelled) with an assumption about the present (she must be afraid). This contrast is a very common way to trigger the future of probability.

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