Modals can be used to show expectation. Be supposed to is used to show expectation. Be supposed to can show that an event is expected to occur. - My program is supposed to start in an hour.
- The concert is supposed to last two hours.
Be supposed to can show behavioral expectations. - You are supposed to be doing your homework.
- He is supposed to take his medicine every day.
Be supposed to when used in the past expresses an unfulfilled expectation. In other words, it didn't happen. - He was suppposed to graduate from college.
- She was supposed to take out the trash.
- They were supposed to report for duty this morning.
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