In French, to express "before" + verb, you use "avant que" followed by a verb in Mode subjonctif.
Using "avant que" with Mode subjonctif in French
Look at these sentences:
To express before + verb (= before you do this) in French is a bit more complicated:
Note that in speech, the ne explétif can be dropped.
Il viendra te voir avant que tu ne partes.
See also What is the ne explétif and when to use it in French
and Après que + indicative (L'Indicatif) = After + conjugated verb in French
as well as other similar expressions using subordinating conjunctions:
À moins que + ne explétif + the subjunctive mood (Le Subjonctif) = Unless you do in French
De peur que + ne explétif + the subjunctive mood (Le Subjonctif) = for fear that in French
Sans que (+ ne explétif) + the subjunctive mood (Le Subjonctif) = Without doing in French
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