In my opinion, this would be a somewhat dated use of the subjunctive. It might be common in the literature of a hundred and fifty years ago. It could also be interpreted as showing obligation.
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AnonymousHe should be joyful if you would do that for him.This seems an attempt to resurrect an old-fashioned way of speaking, but I think it misses because that turn of phrase, as I recall it, goes with the first person, thus:
Anonymous"'should' in the main clause and 'would' in the if-clause."I think we've already addressed this. You can construct a sentence like this which is correct, but it's not the most usual pattern in modern English. Here's an example:
Anonymous I also want to correct this: the pertinent part or parts of my post, including the thread title, should have wording that says "'should' in the main clause and 'would' in the if-clause."LOL! That "error" blew right by all of us! - A.