French language Q&A Forum

If ce qui/ ce que is supposed to be used to refer to a part of a sentence/ an idea, instead of just a single word, then why does this sentence use ce que?:

"C'est tout ce que j'ai dit"

I know that 'tout' could be considered a general idea, but why is ce que not used in this sentence, when 'quelque chose' is also a general idea?:

"C'est quelque chose que j'ai dit"

Is it not also valid to ask, “Ça te dire…?” In place of “Est-ce que tu veux..?”

In the quick lesson you use the example Ce problème, auquel je ne comprends rien, m'énerve 

Why is it auquel and not duquel ( or de qui) since comprendre is a transitive verb ? What am I missing?

Il faut que... tu réfléchisses à ce que cette amitié t'apporte réellement.

Pourquoi le subjonctif ici?

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I was watching a short youtube video in which, if I understood the gist of it, a bilingual gentleman was giving students advice in how to translate.  I thought I heard him address his audience repeatedly by 'tu'. I don't know if it was a tongue in cheek humour or was he being unusually familiar, The video was here:

https://www.youtube.com/watch?v=yHKoBeDltjY

Merci.

I don't seem to be able to find anything on this topic, although it is quite fundamental and also allows one to practice lots of tenses as one switches between direct and indirect speech.  Any chance of this topic appearing?