meaning of phrase 'supposed to'

[Arya]

how to use 'supposed to'

[Kitosdad]

You were supposed to be here at 8 o'clock.

You were supposed to wear a suit for the wedding.

You were supposed to be my friend.
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Keep it simple ... Keep it interesting.

[Shyone]

You are supposed to start every new sentence with a capital letter.
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[Kitosdad]

And end it with a full stop.
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Keep it simple ... Keep it interesting.

[Shyone]

Or a question mark perhaps?
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[Kitosdad]

I too thought of that, but was it a direct question Andrea ?
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Keep it simple ... Keep it interesting.

[Shyone]

Well, it has to be a question. Otherwise it would sound like the headline of an explanatory article on the subject.
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