What is the correct question form to this?- (Due to heavy fog), none of the planes could take off?

Answers (1)

It is not clear what you are trying to ask.

Votes: +1 / -0

I want to form a special question to this sentence. And I want to give a question to "due to heavy fog". Is it true "Why couldn’t any of the planes take off?" or "Why could none of the planes take off? || Why none of the planes could take off?

Both your examples are correct.