French language Q&A Forum

So instead of using Je I have to use J'ai ? Am I understanding this correctly?

in the fillin the blank quiz for the plus-que -parfait, my answer was marked as nearly correct yet i do not understand why 

This idea also exists in English ie 'He's selling his motorbike' can mean is is actually in the act of selling it in the present moment OR it can mean that he intends to sell it in the future. 

1/ Nous avons froid quand vient l'hiver 

2/ Nous avons froid quand l'hiver vient 

I am a bit confused about when an extra pronoun comes in to inverted question forms.  I thought that "What does Paul want?" would be "Que Paul veut-il?".  Similarly with "What are the children drawing?", I was expecting "Que les enfants dessinent-ils?

Is it correct? "J'ai faim parce que je ne mange pas le déjeuner"

Are both of these sentences grammatically correct? I understand why 'ce qui' in the first sentence is correct, but not why 'ce que' would be correct in the second one. I would be grateful for an explanation.

Ce qui à un moment donné est le substrat, n’est pas chaud