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SIMPLE PRESENT

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The simple present is a verb tense with two main uses. We use the simple present tense when an action is happening right now, or when it happens regularly (or unceasingly, which is why it’s sometimes called present indefinite). Depending on the person, the simple present tense is formed by using the root form or by adding ‑s or ‑es to the end.


Do - don't - does - doesn't

AFFIRMATIVE SENTENCES 

The words do, don't, does and doesn't, appear a lot in English.
This is because they can be used as verbs or modals (helping verbs).
They are used in making affirmatives (statements) and questions.
In making affirmatives (statements): DO / DON'T / DOES / DOESN'T comes AFTER the subject.
Examples:
- THEY DO their chores when they arrive home.
- SHE DOES charity work when she has time.
- I DON'T speak Spanish.
- JAMES DOESN'T drive on Saturdays.

INTERROGATIVE SENTENCES 
In asking questions: DO / DON'T / DOES / DOESN'T come BEFORE the subject.
Examples:
- Where DO YOU live?
- DOES HE drive to work?
- Why DON'T WE visit the national park? It's so much fun!
- Lucina speaks Dutch, DOESN'T SHE?

NEGATIVE SENTENCES 
So, is there any difference among these four little words? Of course not! DO / DON'T / DOES / DOESN'T are simple present tense form of the verb "to do". DON'T (do not) is the negative form of DO while DOESN'T (does not) is the negative form of DOES.
The tiny difference is:
- Use DOES / DOESN'T if the subject is third-person singular (he, she, it).
- Use DO / DON'T everywhere else. That is plural nouns and with the pronouns I, you, we and they.
In summary:
> I / you / we / they - do / don't
> he / she / it - does / doesn't



SOME EXERCISES 

Bibliographical sources



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