WHAT WAS EXPECTED BUT DIDN'T OR WON'T HAPPEN / INTENDED TO
It's supposed to be a barbecue.
I'm supposed to be studying for an exam (but I'm not).
I wasn't going to go to the party (but I guess I will).
THEY SAY
It's supposed to rain later.
WHAT SHOULD HAPPEN VS. WHAT DOES OR WILL HAPPEN.
They were supposed to come at 7:00 (but they didn't).
I'm not supposed to stay out late (but maybe I will)
He was going to give us directions (but he didn't).
I wasn't supposed to go by myself (but I'll have to).
He's not supposed to eat chocolate.
HAVE TO OR SHOULD
I'm supposed to work tomorrow.
