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Present perfect


Could you please help me with this small text:

For Princess Leia to talk, Princess Leia needs to move and her mouth needs to move, etc. And >>you haven't been able<< to do that with a regular hologram because the hologram would only be fixed in one spot.
Why present perfect is used? Could we use - Could not be able or would not be able here?

For learning: English
Base language: English
Category: Language



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    Best Answer - Chosen by the Asker
    Haven't been able implies that there is some new technology which means that up to now it couldn't be done but you can do it now.

    "Haven't been able to do that" can be correct. If the nuance the speaker is trying to convey is that no one has been successful at doing it at this point in time, then it makes sense.

    I agree though, that "wouldn't be able to do that" sounds more natural.

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