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I have come across the phrase I will do used as a response. Somehow, it seems incomplete. Shouldn't it be I will do that?

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Are you sure it was that? It's more likely to be 'will do'. – Barrie England Nov 16 '12 at 11:45
This is also an important question to answer. You might have P1: “You will go and look it up and find out.” P2: "I will!" – user19148 Nov 16 '12 at 11:46
"Can do, can do, this guy says the horse can do." —Frank Loesser, lyricist for Guys and Dolls, born in New York. See also this question. – Peter Shor Nov 16 '12 at 11:56
This is by non-native speakers. It is not a phrase that I have ever heard or read elsewhere. I guess the question is whether the phrase is grammatically correct but wrong as being not used in language, or is it simply wrong grammatically and customarily? And if it is wrong grammatically then why? – Jason Nov 16 '12 at 12:21
As Will Hunting's answer shows, the phrase is customary in one context, strange in another. The question can be improved by adding more context leading up to the phrase. The question also shows no research effort. – MετάEd Nov 16 '12 at 13:58

The reply I will do is to me less common than the other possibilities I will and I will do so, but perfectly normal. I will do that (in this sense) is even less likely, but still possible.

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I will do might be a response to Will you do that? in which case I will do that is a more usual response. However I will do could also be a response to the question Who is good enough for the job?, in which case it means I am good enough.

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