Can you please explain "would have"?
"Today a member of the clergy might sneer at this custom, expecting that by this time such superstitions would have receded into the past with witches and ghosts."
The key word is 'expecting'. You can say it with 'had receded': A member of the clergy might expect that such superstitions had receded into the past . Substituting 'would have receded' makes the expectation more emphatically counterfactual.
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The key word is 'expecting'.
You can say it with 'had receded':
A member of the clergy might expect that such superstitions had receded into the past.
Substituting 'would have receded' makes the expectation more emphatically counterfactual. The clergy member might expect this to have happened, but it didn't happen.
A member of the clergy might expect t