Element USE: PAST SPECULATION
SuperCat MODALITY
SubCat could
Lexical Range N/A
Level B2
Cando Can use 'could have' + '-ed' to speculate about the past.
Corrected Learner Example I thought perhaps a thief could have entered my house. (Italian, B2 VANTAGE, Pass, 1993)

? she could have ruined everything I had been preparing for almost four weeks. (Portuguese, B2 VANTAGE, Pass, 1993)

If he had mugged her, who could have saved her? (Italy; B2 VANTAGE; 1993; Italian; Pass)
Uncorrected Learner Example
Comments N/A

Cambridge University Press