Possibility, Intention, Obligation

How serious are you?

will	absolutely, sure, definitely, no doubt	100%
must	compulsion, imperative or directive	95%
need to	required, but might not be done	90%
had better	if it isn't done something bad may happen	90%
has got to, have got to	can't hesitate	90%
supposed to	a demand by others	85%
has to, have to	an obligation or demand	85%
should, ought	probably, it's a strong suggestion	85%
ought to	it's a good idea	75%
might, may	not sure, don't know, possibly, maybe, perhaps	50%
could	able to, it's possible, perhaps	50%
shouldn't	don't think so, probably not, I doubt it, better not	25%
don't have to	something is not necessary, but you can do it if you want to -- it's up to you.	10%
couldn't, can't	not able, don't know how, unliikely	10%
must not, mustn't	something is not allowed; it is forbidden, and you definitely shouldn't do it.	5%
won't	definitely not	0%