'To suppose' and 'to be supposed to' are two different verbs. org/dictionary/british/supposed_1 Just don't confuse the passive voice of the first with the second one: He is supposed to be at home (by someone) = The person supposes (= thinks) that he is at home He is supposed to be at home by 10 PM = He is required to be at home by that time
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Mister MicawberHe is supposed to be at home (by someone) = The person supposes (= thinks) that he is at homeHe is supposed to be at home by 10 PM = He is required to be at home by that timeNote that the underlined s in the first is pronounced /z/, and in the second /s/.