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Why can't we say "She doesn't HAS a book."

We can say She HAS a book.

With the pronoun He and She why does "has" change to "have" in the following sentences:

She has a book.
She doesn't have a book.

I KNOW when you add "doesn't" (the not have) you must change had to have. BUT, why is this so?

Why can't we say She doesn't has a book.
What is the grammar rule here?
Is there a rule or is it something that we just accept as so.

For learning: English
Base language: English
Category: Uncategorized



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    Best Answer - Chosen by Voting
    The Simple Present of the verb to have is slightly irregular, since the bare infinitive is have, whereas the form of the verb used in the third person singular is has. (she has, he has, it has)

    do , does (for the third person singular) are auxiliaries to form questions and negative statements in the Simple Present.

    When the auxiliaries do, does are combined with another verb, the other verb always has the form of the bare infinitive.

    So, she doesn't have a book.

    Dear teach, please help us with an open question at this location>
    we nead some explanations about present perfect simple and continuous.
    Thank you much in advance! Sorry I have contacted you in here.

    You can think of it in terms of which verb is conjugated to match your subject. Here are examples.

    #1 [Subject]+[conjugated verb] [article] [object].
    She has a book.
    He eats a cake.
    They ride a rollercoaster.

    #2 [Subject]+[conjugated verb] [negation word] [object].
    She hasn't a book.
    He eats no cake.
    They ride no rollercoasters.

    #3 [Subject]+[conjugated verb] not [infinitive form of verb] [article] [object].
    She does not have a book.
    He does not eat cake.
    They do not ride rollercoasters.

    Note that example #2 has a slightly different meaning than #3. #2 emphasizes the verb as the thing that is not done, rather than the object. (He eats no cake = he might be a cake decorator but he eats no cake. He does not eat cake = he eats cookies and chocolate but he does not eat cake specifically.)

    we say : she has a book
    the tense in this sentence is the present simple . And the sentence is formed unconsciously in the human brain like :
    she does have a book
    the auxiliary takes the tense of the main verb " have ". And the process of making questions in English is based on subject-verb inversion ; so :
    Does she have a book ?

    now we move to the negative statements :
    we say : she does have a book
    the negation : she does not have a book
    the short form is : she doesn't have a book

    it seems that u r c chinese who learn english .the question should be asked by foreigners who learn english ,right?

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