If someone says "you can't do that" there's a colloquial response of "can too". Is it "can too" or "can to"?
closed as general reference by tchrist, Matt Эллен, MετάEd, Kristina Lopez, onomatomaniak May 14 '13 at 18:54
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The appropriate phrase would be 'can too'. This one I'm going to have to go on process of elimination because 'can to' doesn't make any grammatical sense, be it colloquial or otherwise.
One would think that the use of 'too' in that phrase came from one of its meanings:
But we're not exactly expressing one's ability to do something 'as well'. Rather, we're negating the previous person's assertion that we cannot do it. Regardless, the answer is 'can too'.