Breakdown of S'il y a des radiations et que tu sois en apesanteur, tu dois rester dans le vaisseau.
être
to be
tu
you (informal singular)
et
and
des
some (plural indefinite)
dans
in, inside
il y a
there is / there are
en
in, to
rester
to stay
devoir
to have to / must
si
if
que
that (introducing a clause)
le vaisseau
the spaceship
l'apesanteur
the weightlessness (f)
la radiation
the radiation
Questions & Answers about S'il y a des radiations et que tu sois en apesanteur, tu dois rester dans le vaisseau.
Why do we use que tu sois instead of just repeating si and saying et si tu es?
In French, when you have two conditional clauses joined by et (and) or ou (or), it is considered clumsy to repeat si. Instead, you replace the second si with que. However, this substitute que triggers a special rule: it forces the following verb into the subjunctive mood, which is why we use sois instead of the present indicative es.
Since sois is in the subjunctive, why is the first verb a in the present indicative?
The first verb is part of a standard si clause, and si is never followed directly by the present subjunctive. The rule requiring the subjunctive only applies to the second conditional clause introduced by the substitute word que. Therefore, s'il y a follows the normal rule of taking the present indicative.
Why do we use the preposition en for en apesanteur instead of dans?
The preposition en is used here because it expresses being in a specific physical or abstract state, much like en paix (at peace) or en danger (in danger). While dans is mostly used for physical locations you can go inside, en apesanteur describes the condition of weightlessness.
Why is radiations plural in French when the English translation uses the singular word radiation?
Why is the word vaisseau used here instead of bateau or navire for the ship?
While un bateau or un navire specifically refer to ships or boats on the water, un vaisseau is used for spaceships (un vaisseau spatial). Given the context of weightlessness and radiation, it naturally refers to a spacecraft in this sentence.
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