"I could never do what he did."
Is the speaker saying that in his whole life time, past, and future, he will never be able to/was never able to do what "he" did?
The standard meaning of this phrase is that the speaker lacks the ability or the personality to do (in the future) what the other person has already done. Climb Mount Everest? I could never do what those climbers have done.
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The standard meaning of this phrase is that the speaker lacks the ability or the personality to do (in the future) what the other person has already done.
Climb Mount Everest? I could never do what those climbers have done.
Rob a bank? I could never do that.
Does this help?