Bonjour
B- Qu'est-ce que tu fais demain ?
Je vais à la piscine.
<em>What</em><em> are you doing tomorrow ?</em>
<em> I go to the swimming pool.</em>
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D- Qui est-ce que tu as invité à la fête ?
<em>Who</em><em> did you invite at the party ?</em>
<em>-</em>
B- Qu'est-ce qui va le plus vite, l'avion ou la voiture ?
L'avion bien sûr !
<em>Which </em><em>is going faster, the plane or the ca ?</em>
<em> The plane of course !</em>
<em>-</em>
C- Qui est-ce qui va en France avec lui ?
Mon frère Jules.
<em>Who </em><em>is going with him in France ?</em>
<em> My brother Jules.</em>
<em>-</em>
Explanation
<em>I must admit it's not so easy to explain...</em>
Try to find out the subject to the question.
<u><em>Qu'</em></u><u><em>est-ce </em></u><u><em>que </em></u><u><em>tu fais ? = what are you doing ?</em></u>
"qu' " stands for "quoi" in an elision form. <em>(what)</em>
the answer is a fact.
je vais nager/ je vais à la piscine
<u>Qu</u>'est-ce <u>que</u> = answer => direct object (things)<em> </em><em>OR </em><em>place phrase</em>
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<u><em>Qui </em></u><u><em>est-ce </em></u><u><em>que </em></u><u><em>tu as invité à la fête= Who did you invite ?</em></u>
<em>the subject of the answer is "des amis" (friends" ) probably.</em>
The answer are persons, so "qui" = "who"
<u>Qui</u> est-ce <u>que</u> = answer = direct object persons
-
Qu'est-ce qui va le plus vite ?
<em>the subject of the answer = the plane</em>
<u><em>Qu' </em></u><em>est-ce </em><em><u>qui</u></em> = answer = subject thing
-
<em>Qui est-ce qui</em><em> va en France avec toi ?</em>
<em>answer = Jules, subject person</em>
<em>Jules va en France</em>
<u><em>Qui </em></u><em>est-ce </em><u><em>qui</em></u><em> ? =</em><em>answer= </em><em>subject person</em>
<em>-</em>
Hope this will help ☺☺☺
