The overwhelming majority of contexts for 'He was supposed to come at 5'
show it means a kind of reproach - it's already 6 and he didn't come at the time agreed. Similar to 'He should've come at 5'.
The questions are:
1. Can this sentence suggest merely stating a past obligation as in we'd agreed upon 5, but I don't know if he came or not?
2. If it usually cannot, is there not even a slightest ambiguity to it?
3. If there is still an element of ambiguity, am I correct in thinking that the perfect infinitive sometimes used in 'He was supposed to have come at 5' is there to avoid it?
4. And thus, at least in some contexts, is it correct to correlate
He was supposed to come. = He was to come.
He was supposed to have come. = He was to have come.
Or do they function differently (tense-wise and meaning-wise)?
As always, appreciate your efforts in advance. Thank you,
YETY
YETYland 1. Can this sentence suggest merely stating a past obligation as in we'd agreed upon 5, but I don't know if he came or not? Yes.
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YETYland1. Can this sentence suggest merely stating a past obligation as in we'd agreed upon 5, but I don't know if he came or not?
Yes.
YETYland2. If it usually cannot, is there not even a slightest ambiguity to it?
There is always ambiguity in a sentence in isolation. Context will show which is meant—as you have