i Register
In some senses, supposed is marked as idiomatic. Watch for register when choosing this word.
ADJ.
based, complete, diligent, fat, hard, valuable
He was supposed to be a hard worker, but he rarely finished his projects on time.
VERB + SUPPOSED
am, figure, mind
I figure I'm supposed to finish this report by Friday afternoon.
SUPPOSED + NOUN
author, baseball, dangers, heart, king, marilyn
The supposed author of that anonymous letter was never identified by the police.
PREP.
in, on, than, up
I was supposed to meet my friend at the cafe, but I completely forgot about it.