hachi8 I guess this would be a very weird question for native speakers, but why doesn't "can have done" exist while "could have done" does? It exists but with the negative "not". He can't have done it while in London.
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hachi8 I guess this would be a very weird question for native speakers, but why doesn't "can have done" exist while "could have done" does?It exists but with the negative "not".