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What is the actual spelling/pronunciation? What is the origination of this phrase?

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up vote 17 down vote accepted

Supposed to is a very common phrase, as in: you are not supposed to come in here. It means you should not come in here, you are not meant to come in here. Using *suppose to in this sentence would be considered wrong by most educated speakers. The cause of this common omission of the d is probably that dt sounds the same as t, so that there is no difference in pronunciation between supposed to and *suppose to.

To suppose something means to assume something. When used in a passive construction, you use a form of the verb to be plus the past participle of to suppose, which is supposed. To be supposed to means to be expected to, to be obliged to. You can see that the verb gets a somewhat different sense in the passive voice from what would normally be expected.

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Good explanation. +1 – Robusto Jan 7 '11 at 2:23

The original meaning of "suppose" is epistemic: "think", or "assume".

But various modal verbs, such as "must", have both deontic ("you must go" = "you ought to go") and epistemic ("you must be" = "I conclude that you are") meanings.

In the passive only, "suppose" has acquired a deontic sense.

Nowadays "suppose" nearly always takes a sentential complement ("I suppose that ... "), but in older or more formal English it can take a direct object and an deonticinfinitive complement "I supposed him to be ... ".

So "He was supposed to go" is the passive of a construction which is now rather restricted, in the epistemic sense of "It was thought that he was going". But in the specialised deontic sense, the construction has survived.

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