Bonjour Johnny !
"Comment cela se fait que ... ?" can indeed be used by some French people, however it's grammatically incorrect as the way to construct the elegant form is through the use of the inversion "-il", and NOT cela.
You can also encounter "Comment cela se fait-il que ... ?" which is simply redundant, as it literally means "How come this that ...?"
However, given the fact that some people do use that incorrect form, I decided to change our marking to Half Correct, as we still aim to teach the correct French ;)
I hope that's helpful!À bientôt !
Sign in to submit your answer
Don't have an account yet? Join today
Test your French to the CEFR standard