French language Q&A Forum

I have a question. In a writing execrise, it requires translate the sentence: My new school bag is blue and yellow. I understand it's a new brand school bag that hasn't be used before, so I wrote: Mon cartable neuf est bleu et jaune. But it marks wrong and the correct one is: Mon nouveau cartable est ...

Why is that and is my sentence correct? 

We know that “on” has been explained to mean “one” (in general terms) just like in English, in which case in the sentence above it would mean “no one is allowed to park here, generally”. So I am confused by the fact that, the answer to the multiple choice questions did not include the above option as a valid answer :(

so is it that celebrer has the changing accent on the second e even though it is not e-er verb but an etwo letters er verb?

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In the sentence "Nous faisons de progrès ensemble." Could one say "On fait de progrès ensemble"?

Why does one say 'appelez-le' but 'téléphonez-lui'?

I have trouble hearing the difference between "serai" and "serais".  Does one rely on context, or is there some magic formula that will make everything clear? :)

This part of the lesson is really messing with my learning process. Please answer me this....In the example, "Tu manques à Lise", IS it or IS IT NOT "Lise misses you."  ???