The answer largely depends on where you stand and could come up to 16 or even more. To start off, try to determine which tenses these examples are.
· He used to stay at home a lot.
· He would stay at home a lot.
· He would like to stay at home.
· He is going to stay at home.
· He might be staying at home.
· He won’t stay at home whatever I say.
Chances are, you’ll be confused as they quite don’t fit in with the conventional table of tenses you were taught at school. Not even the last one since it means "he refuses to stay at home" and therefore cannot be referred to as Future Simple. Future Simple is supposed to be about the future, isn’t it?
Moreover, terms like Present Perfect or Past Continuous will ring no bell with the majority of even educated native speakers, at least, no more than 'pluperfect' (the technical term for Past Perfect) does with us.