that's what
C'est ce qui me fait le plus peur.
That's what scares me the most.
That's what's going to happen.
That's what drives me crazy.
Elle aimait trop le bal c'est ce qui l'a tuée.
She loved dancing too much; that's what killed her.
C'est ce qui rend la vie intéressante.
That's what makes life interesting.
C'est ce qui m'aide à la supporter.
That's what helps me put up with it.
— Les Fraises sauvages (1957)
That's what interests me.
C'est ce qui me plaît chez vous.
That's what I like about you.