That seems possible if you're talking about a recent event/situation. Otherwise, I'd use ' did everything they could '. I probably wouldn't use a present perfect with could though.
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IvanhrThat seems possible if you're talking about a recent event/situation.But a present perfect is still a past event, which is why I think using ‘could’ would be correct. Right?
AnonymousBut a present perfect is still a past event, which is why I think using ‘could’ would be correct. Right?What context do you have in mind? (other than the above sentence in isolation)