comment l'avez-vous

how did you

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phrase Rare #23,417
how did you Used in questions before a past participle: l' means it, him, or her depending on context.
FR: Comment l'avez-vous su ?
EN: How did you know that?

Comment l'avez-vous connu?

How did you meet him?

Comment l'avez-vous su?

How did you find out?

— Rebecca (1940)

Comment l'avez-vous perdu?

How did you lose it?

Comment l'avez-vous eu?

How did you get it?

Comment l'avez-vous deviné?

How did you guess?

Comment l'avez-vous trouvée?

How did you find it?

Comment l'avez-vous appris?

How did you learn that?

Comment l'avez-vous rencontrée?

How did you meet her?

— Bajrangi Bhaijaan (2015)

Comment l'avez-vous identifié?

How did you identify him?

— Chute libre (1993)

Comment l'avez-vous découvert?

How did you discover it?

Comment l'avez-vous trouvé?

How did you find it?

Comment l'avez-vous connue?

How did you meet her?

Comment l'avez-vous rencontré?

How did you meet him?

Comment l'avez-vous obtenu?

How did you get it?

Comment l'avez-vous eue?

How did you get it?