Usages of servir de
Cette photo peut servir de preuve si le colis arrive en retard.
This photo can serve as proof if the package arrives late.
Ce canapé sert de lit quand mes parents arrivent.
This couch serves as a bed when my parents arrive.
Cette copie peut servir de preuve.
This copy can serve as proof.
Ne jette pas le ticket de caisse, il peut servir de preuve.
Do not throw away the receipt, it can serve as proof.
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