Basic - The Auxiliar Verb DO and the Third Person

We use the auxiliar verb DO when there is not any TO BE verb in the phrase. It just appear in the negative and interrogative forms.

You like me. - AFFIRMATIVE

You do not like me. - NEGATIVE (Just put the 'not' after the auxiliar)

Do you like me? - INTERROGATIVE

Note: In the third person, HE/SHE/IT, this verb becomes DOES (put the 'es' in the end of the 'do')

She likes me. - AFFIRMATIVE

She does not like me. - NEGATIVE

Does she like me? - INTERROGATIVE

The third person verbs:

We just put the 's' in a most part of the verbs in English:

She likes

He loves

It looks

The verb HAVE is an irregular one, so, we have to change its original form, look:

I have

She has