This lesson refers to the Infinitif Passé. I have been doing the lessons in order since level A0 and I don't think I have seen Infinitif Passé before. I figured it out, and finally noticed the link to a lesson about it at the bottom of the page, but perhaps this lesson could explain briefly what it is, rather than using the name without previous explanation.
The problem, I think, is that it might overload the lesson which is already quite substantial.
I am pleased that you found the link to the infinitif passé at the bottom of the page and thank you for letting us know.
Just posting it here again -
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