French language Q&A Forum

What I want to say is when we are ask 

One mustn't talk back to one's parents.

On ne doit pas répondre à ses parents.  

Your answer is  " On " that is what I don't understand to me the question does not say We mustn't talk back to one's parents. so the answer  should be "Un" if not why ?

C'est pour A1, vraiment ?

Si c'est A1, je n'ai pas de chance a l'epreuve de B2 dans 4 mois.

Meme si j'ai reussi  a A2 il y a 2 mois.

Another verb + preposition question.  Why is it "rester à les regarder" instead of "rester pour les regarder"?

In the listening: Est-que vous vendez des adaptateurs internationaux

Vendez   sounds strange.

I don't quite follow what the "But only" is meaning in the following text from the lesson:

You can also use any of those with ne ... plus (not anymore / not again):plus jamais / jamais plusbut ONLY plus rienplus personneplus nulle part. 

Hello, how come I can't do any tests on the free package? Clicking on tests always leads me to the upgrade page. I thought we get 10 free tests/kwizzes per month. My paid subscription expired on 11 august and I havent used  kwiziq since before that date. Thanks

This exercise only accepts "Je ne sais pas quoi dire" as translation, but I just wanted to confirm that "Je ne sais que dire" is also correct, or is there some difference in meaning between the two that excludes the latter?