Assertion: verb's use | /r/CapableOf | express past possibility
Facets:
value: in some counterfactual circumstance
type: OTHER
Source sentences:
text: The use of could with the perfect infinitive expresses past ability or possibility, either in some counterfactual circumstance (I could have told him if I had seen him), or in some real circumstance where the act in question was not in fact realized: I could have told him yesterday (but in fact I didn't).