French language Q&A Forum

Qu'est-ce que tu penses?

but,

Qui est-ce qui vient ce soir?

Just wondering why 'Qui', which ends in a vowel, wouldn't contract when the following word begins with a vowel, as does the example with 'Que'?

What is the difference between "Isaac, tu t'es bien reposé ?" and "Isaac, tu as bien reposé ?"?

Why don't we use indirect object pronouns like je leur pense ?

Hi, 

I was wondering if somebody could explain to me please when one should use 'Y' vs using 'En'.
For example, in trying to say "She thinks of it" - could it not be "elle y pense" or  "elle en pense"? 
Is it just determined by the context? Ie if the sentence before used De use En or if it used A use Y? 

Any help greatly appreciated.

When do we use marron or brun for the color brown?