French language Q&A Forum

When do I use j'ai or je suis because they both mean the same thing so I don't know when's the time to use which I have

Is there a mistake in the video at approximately the 1:08 mark? The example says:

Je mange une pomme and Tu *parle* à Marie. Shouldn't it be Tu *parles* à Marie?

What does the "en" in this clause express?  Thanks.

I noticed that an example given above " Elles ne l'ont fait expres" means They didnt do it on purpose. Im wondering why it isnt Elles n'en ont pas fait expres. Doesn't en replace phrases after de? 

I have seen the phrase avoir à a couple times, and I was wondering how it differs from il faut and devoir - is it a less formal version of both of them, a more informal iteration of only one, or is it a completely different idea that it expresses

Is "mettre les affaires dans" not an acceptable translation of "to pack"?

Merci!

Thomas va chez ___________ oncle (adjectifs possessifs)

Pourquoi DE ici et pas ‘des’, ‘du’ et ‘des’?

I have a question about the number one in front of larger numbers. Is One hundred million written ‘un cent milliards’, ‘une cent milliards’ or ‘cent milliards’