tu ne l'as

you haven't

→ tu
phrase Common #6,151
you haven't The structure tu ne l'as pas/jamais... means “you haven't...” or, depending on context, “you didn't...”. Here, l' is a contracted object pronoun meaning “it,” “him,” or “her,” while as is the auxiliary avoir used to form the past tense.
FR: Tu ne l'as pas encore compris.
EN: You still haven't understood it.

Eh bien, si tu ne l'as pas fait, alors qui l'a fait?

Well, if you didn't do it, then who did?

Tu mens, tu ne l'as même pas nettoyée une seule fois.

You're lying—you haven't even cleaned it once.

— Departures (2008)

Tu ne l'as pas vu.

You didn't see it.

— Devdas (2002)

Ma sœur t'a aperçu en ville mais tu ne l'as pas vue.

My sister spotted you in town, but you didn’t see her.

Regarde-moi dans les yeux et dis-moi que tu ne l'as pas faite.

Look me in the eyes and tell me you didn't do it.

Tu ne l'as dit à personne?

You didn't tell anyone?

J'ai passé plus de temps avec lui que tu ne l'as fait!

I spent more time with him than you did!

— Don Juan DeMarco (1994)

Ma sœur t'a aperçue en ville mais tu ne l'as pas vue.

My sister saw you in town, but you didn’t see her.

Je sais que tu ne l'as pas fait exprès.

I know you didn't do it on purpose.

Tu ne l'as peut-être jamais remarqué au milieu de cette grande famille.

You may never have noticed it amid that large family.

— Devdas (2002)