I am interested in this sentence:
He ______ his boss that he ______ back after his vacation.
a) doesn't tell / hasn't come
b) won't tell / won't have come
c) isn't telling / doesn't come
d) hasn't told / won't be coming
e) didn't tell / hadn't come
I've answered B but it's obvious that we can't have a sentence with two auxiliary verbs "to be" in the future form. But the right answer is D and I'm curious about the secont part. Since won't be coming is the future continuous tense I find no way of implementing it in this sentence, Am I mistaken? What way of usage the future continuous is it?