Breakdown of Une fois que tu as vu le schéma, retire doucement le détonateur.
tu
you (informal singular)
avoir
to have
voir
to see
le
him, it (masculine direct object pronoun)
retirer
to withdraw / to remove, to take out
une fois que
once
le schéma
the diagram
doucement
gently
le détonateur
the detonator
Questions & Answers about Une fois que tu as vu le schéma, retire doucement le détonateur.
Why do we use the passé composé (as vu) here instead of the future perfect?
Normally, if the main clause is in the future tense, a temporal clause starting with une fois que takes the future perfect (futur antérieur). But here, the main verb (retire) is an imperative command, not a future tense. When the main clause is an imperative or in the present tense, the une fois que clause uses the passé composé to show the action must be completely finished before the command applies.
Does une fois que ever trigger the subjunctive mood?
Why doesn't retire have an 's' at the end, since the sentence clearly implies the tu form?
Retire is an imperative, which means it is a command. For all regular -er verbs like retirer, the tu form of the imperative drops the final -s. If it were a normal statement it would be tu retires, but as a command, it's just retire.
What is the exact difference in nuance between using une fois que and dès que here?
They are very similar and can often be swapped. Une fois que emphasizes the completion of a condition (once this is fully done). Dès que translates to "as soon as" and emphasizes the immediate timing of the next action. Here, seeing the diagram is a prerequisite that needs to be finished first, so une fois que fits perfectly.
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