Uses of Have and Has: The poem does not have a rhyming scheme is correct and...

[Ambarey]

I want to know the logic behind the uses of the words 'have' and 'has'.for eg i knw tht the sentence-
The poem does not have a rhyming scheme is correct and the poem does not has a rhyming scheme- is incorrect but whats the explanation behind it?please expain
thanx
rgds
Amby

[Alan]

Hi Amby,

If you want to make a verb negative in the Present Simple, you use the right form of 'do' and the infinitive of the main verb. Examples: I understand - I do not (I don't) understand I see - I do not (I don't) see The poem has a rhyming scheme - The poem does not (doesn't) have.

Alan
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English as a Second Language
You can read my ESL story Present Simple