Expressing cause with "Pour (+avoir) fait" = For doing/having done in French

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To express for doing [something] in French, you use pour + Infinitif passé. 

Using "pour avoir fait" in French

Look at these examples:

Tu auras une médaille pour avoir sauvé ce pauvre chat.You'll get a medal for having saved that poor cat.

Nous avons été punis pour avoir menti au prof.We were punished for having lied to the teacher.

Note that in French, if you're talking about an action that's in the past, you have to use pour + Infinitif passé.
Indeed, you can never use pour + [Infinitif] (i.e pour faire ça), the way you say for doing that in English! 

To express for + -ing / for having + past participle in French, you use the same following structure:

pour + Infinitif passé (= infinitive of auxiliary (être or avoir) + past participle

ATTENTION: 
Use the same auxiliary as in compound tenses like Le Passé Composé.

When using avoir preceded by an object pronoun (e.g. pour l'avoir aidé/e), you need to agree the past participle with the object referred to by the object pronoun!
Tu es récompensé pour l'avoir aidée.You are being rewarded for helping her.


It's worth noting that this causal pour - giving a reason or cause - is more common in French and can often be translated into English using causal expressions using because, as or since and repeating the subject of the main clause.

Pour l'avoir connu depuis longtemps, je trouve son comportement troublant.As I've known him for a long time, I find his behaviour troubling.

-> This last example literally means For having known him for a long time, ...


See also cases with auxiliary être: Expressing cause with "Pour (+être) allé" = For going/having gone in French 

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Examples and resources

Pour l'avoir connu depuis longtemps, je trouve son comportement troublant.As I've known him for a long time, I find his behaviour troubling.
Tu es récompensé pour l'avoir aidée.You are being rewarded for helping her.
Nous avons été punis pour avoir menti au prof.We were punished for having lied to the teacher.
Tu auras une médaille pour avoir sauvé ce pauvre chat.You'll get a medal for having saved that poor cat.
I'll be right with you...