JAMB - English Language (2019 - No. 111)
Jide couldn't have said that. This means that Jide
ought not say that
will not say that
it's not likely jide said it
Jide didn't say it
Explicació
"Couldn't have" here indicates the impossibility that Jide said it at all i.e it is rather unlikely for Jide to have said it.