Breakdown of Le bouclier préventif isole le virus avant qu'il ne se propage.
il
he
le
him, it (masculine direct object pronoun)
le virus
the virus
avant que
before (conjunction)
ne
expletive 'ne' (no negative meaning)
se propager
to spread (disease/fire)
isoler
to isolate
le bouclier
the shield
préventif
preventive
Questions & Answers about Le bouclier préventif isole le virus avant qu'il ne se propage.
Why is there a ne here? Does this mean "before it doesn't spread"?
No, the sentence is not negative! This is called the ne explétif (expletive ne). It has no negative meaning and is just a stylistic word used in formal or written French after certain conjunctions, like avant que (before), à moins que (unless), and de peur que (for fear that).
Do I always have to use this ne after avant que when speaking?
Is se propage in the present indicative or the subjunctive? They look exactly the same!
It is in the subjunctive! The conjunction avant que always requires the verb that follows it to be in the subjunctive mood. For regular -er verbs like se propager, the present subjunctive forms for il/elle happen to be spelled exactly like the present indicative.
Why use the reflexive pronoun se in se propage instead of just saying propage?
In French, the non-reflexive verb propager means to spread something else (like spreading a rumor or a message). When a thing is spreading on its own, like a virus or a fire, you must use the reflexive form se propager (literally "to spread itself").
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