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