In turn, the verb “can’t” used in the present tense means that a situation is impossible.Ĭan’t have, correspondingly, means that a situation could not have happened in the past: When we expressed certainty about an event or state, in the past we use “must have”: When something certainly happened (certainty) He couldn’t have gone to the shopping centre. Whereas negative form “couldn’t have” is used to talk about something that couldn’t have happened and something impossible. I could have gone to the cinema, but I decided to stay home. The form “could have” is also used when talking about something that could have happened, but did not. When something could have happened but did not. ![]() I think/I suspect (probably) I lost my keys in the pubĢ. ![]() I think/I suspect (probably)I lost my keys in the pub To make an assumption about the past, we also use “could have” form. ![]() To make an assumption/guess about the past.Ĭould have and might have can be interchangeable and mean the same thing I think/I suspect (probably) they had never met beforeĬOULD + HAVE + PAST PARTICIPLE 1. I think/I suspect (probably) I lost it somewhere I think/I suspect (probably) I was shopping at that time
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