I want to know Which one is sentence correct between "why does it do not good" and "why does it do no good"? I'm so confusing this.
closed as off-topic by Nathan Tuggy, user3169, jimsug, Sander, M.A.R. ಠ_ಠ Aug 8 '15 at 18:31
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Both the sentences are correct. Compare the following two examples.
I have no book.
<no, an adjective; qualifying book>
I have not a book.
<not, an adverb; modifying the verb, 'have'>
In these instances functionality becomes all the more obvious for article "a" as it does come between 'not' and 'book'.
Do remember the difference. It is never ambiguous. For better understanding, we would write the first sentence like this:
Why doesn't it do good?
It would be proper to take 'not' before the subject if the subject is a pronoun.
You can say why does it do no good
as an informal way of saying:
Why doesn't it help.
Beyond that, you need to add context to see how it works in a particular situation.
I can't see any way that this one makes sense:
why does it do not good
especially the do not good part.