French language Q&A Forum

Why is 'penser a' here, but not 'penser de' (opinion).  Wouldn't it might be good to know that in addition to 'y' for a clause with 'a'; that 'en' for a clause with 'de' is appropriate (and, I think, clearer than just another 'le')?

[Sorry, I can't seem to do the accents, as needed.]

In the phrase, '"ce qui m'a enfin permis de m'ouvrir" why isn't there an "e" at the end of "permis", since the direct object, "m", is a woman?

Why is fut used in the above, rather than était.To the best of my knowledge, we have not been introduced to the Historic?

I just realized that qui is used for living things,  trick question eh

Can someone at least point me to a detailed explanation of when to use Tu. I am 74 and I have assumed nobody will tutoyer me automatically. I would prefer not to tutoyer someone else merely for some hierarchical reason, so I am focusing on the vous form (as does Pimsleur, which I am also using). But, if I go to a French Meet Up in America, will everyone be using Tu? And what about visiting Guadeloupe?