French language Q&A Forum

Can we use the expression "ça roule" as a casual equivalent to "ça va" while writing a letter to a friend?

Hello. My very first question on the forum.  In fact I have a question on the use of "des" rather than marcher, but the guidance on the question led me here.  I am not clear why it is not "les" danseurs being a generic dancer?  Probably some grammar rule that I have missed along the way, but if someone could point me in the right direction I will do my homework!

R.e. this question:

Tous les gosses y vont, mais ________ prend le train.

User "Lolli" in Jan 2018 asked if "personne ne" would also be correct in this sentence (in addition to the "correct" answer of "aucun ne"). I think that in spoken conversation, "personne ne" would be acceptable and convey equivalent meaning. There hasn't yet been a definitive response as to whether "personne ne" is acceptable grammatically. 

Can anyone provide definitive guidance on this? 

(Maybe the kwiziq website logic can't accommodate unanticipated responses?)

What is the difference in usage with cependant, alors que, pourtant, et en revanche? 

Just need a little clarification. Is the verb for "to worry" just "inquieter" or is it reflexive? (s'inquieter) If it is reflexive, how would that change the phrase, "I am a little worried" in French?

I used posé in "et j'y ai placé les tranches de pomme" and it says it is wrong. What is the difference between the verbs poser and placer? 

What is the difference between 'du côté de' and 'au côté de' ?