In French, to express "before" + ing , you use "avant de" + Infinitif.
Using "avant de" with Infinitif in French
Look at these sentences:
To express before + -ing in French, you use avant de followed by the infinitive form of the verb.
Note that any object pronoun or reflexive pronoun is placed between de and the infinitive.
See the more advanced Avant que + ne explétif + the subjunctive mood (Le Subjonctif) = Before I do in French
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Examples and resources
J'ai pédalé dans la choucroute pendant une semaine avant de trouver une solution.I really struggled for a week before finding a solution.