What verb mood is the following sentence written in?

Who died this time?

Which verb mood is the following sentence written in?

This time it's the principal, sir.

Which verb mood is the following sentence written in?

Fred, start asking the staff where they were during the past hour.

Which verb mood is the following sentence written in?

If I can get them all to gather in the cafeteria, this will be easier.

Which verb mood is used in this sentence?

Call them over the intercom.

Which verb mood does the following sentence use?

If they were smart, they already would have gathered there.

Which verb mood does the following sentence use?

How would they know that someone had been killed?

Which verb mood is the following sentence written in?

If they show up without being summoned, I will be suspicious of them.

Which verb mood does the following sentence use?

Why are you saying weird stuff, Sargent? Are you the killer?

Which verb mood imagines things contrary to reality?

Which verb mood asks a question?

Which verb mood makes a command?

Which verb mood states a fact?

Which verb mood requires one thing for a second thing to be true?