French language Q&A Forum

the conjugation of "lire" goes on like "lis" can someone explain how does it work? how come there's an "s"? 

I think this is more a question about the use of lui, but there are some examples here that use it. Ils rient avec lui, pas de lui. They laugh with him, not at him. 

How do we know lui is HIM and not just him/her without any other context. Do I just take the translation for what it is, or am I missing something fundamental? I find this to be so confusing. Thank you. 

The very first example given of when to use "c'est" is:

"C'est une jolie robe."

This clearly refers to a specific dress.

But then we are told that the answer to "Tu aimes mon pull?"  should be "Oui, il est très beau."

Why is the rule for a specifc dress different than the rule for a specific sweater? Is it that "il/elle est" should be used when answering a question about a specific thing but that "c'est" can be used otherwise? 

In 'nous nous étions fait piquer' why does the 'fait' not need to agree with the subject?

sorry if this is a stupid question but why isn't visiter written in the infinitive form after a conjugated verb (rendre) 

I answered like this, il le lui a refusé? Il le nous a refusé aussi, I was wrong. What went wrong, please? 

I think in informal conversations we say like -

Il est pas jeune 

instead of the more formal and more 'grammatically correct' one:

Il n'est pas jeune!

Is it correct !? Responde Sil vous Plait!