French language Q&A Forum

I got this question:

Cette pomme est bonne. - Oui, c'est _______.

I answered bon because I knew to use the masculine, but my question is why it's c'est in this case. I've read the relevant pages ("C'est" vs "Il/Elle est" to say it is/she is/he is in French and Standalone adjectives after c'est are always masculine) and my interpretation is that this would fall under 2b of "C'est" vs "Il/Elle est" to say it is/she is/he is in French: 

'Nous t'avons rendu visite il y a une semaine.'

What is the purpose of rendu in this sentence if visiter can be used as a verb? Possible to say “Nous t’avons visité il y a une semaine”

For me, avoir envie means would like, or wants..., whereas avoir besoin de indicates a need. This distinction seems borne out by the lesson itself, where avoir envie is NOT shown as an alterntive to avoir besoin de...In your lesson you say that in some/certain cases avoir envie can mean "need", but there are no examples of this and there's no explanation. Looking at the examples, it appears that avoir envie CAN mean "need": IF it is followed by "aller". I agree with Sandra (below). This matter shouls not be tested until the distinction is made clear.

please explain when to use ennuyant and ennuyeux or ennuyeuse

sometimes I'm told it means boring, sometimes annoying, quite confusing, as i cant make out which is which.