I would like to know if the following sentences are correct. I know "WILL" should be used in the main clause, but is it also possible to use "to be going to"?
If she finishes her homework today, she's not going to have any tomorrow.
We are going to be late if you don't put your shoes on right now!
If he keeps writing, he's going to be a good writer.
If you join that course, you're going to meet new people.
We are going to be late for the concert if you don't hurry!
Thank you in advance.