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I feel a bit uncertain about the use of tense in the above sentence structure.

Which one is grammatically correct and sounds most natural between "what it did was," "what it did is," and "what it does is"?

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what it did was, what it did is and what it does is are all grammatical and acceptable (do sound natural). They mean different things and find use in different contexts. Try to ask basic level questions on English Language Learners. –  Kris Jan 18 at 6:08
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1 Answer

up vote 3 down vote accepted

"What it did is" has a tense conflict. Since "did" is past tense, it is jarring to use "is" in present tense. "What it did was" is perfectly fine when indicating what something did during a specific event in the past.

"What it does is", on the other hand, doesn't indicate you're describing a specific past event. It indicates that you're either telling us what it is doing now, what it does in general when called upon to do something, or what it would do in a particular situation.

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Awesome. Cheers, David. –  woodykiddy Aug 13 '11 at 8:52
    
So which one of these is correct - "I did hear them talking" or "I did heard them talking"? –  Nikhil Patil Sep 12 '11 at 11:20
    
The former, but I don't know why. Anyone? –  David Schwartz Sep 12 '11 at 18:31
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-1 "What it did is" has no tense conflict. Did and is are independently referring to different things and do not need to agree on tense. –  Kris Jan 18 at 6:04
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