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In the Simple Present the negative and interrogative sentences in English are formed using the auxiliary do or does.

Negative form
The negative form of the Simple Present is obtained by adding do not or does not before the base form of the verb:

Idon’tI don’t work
Youdon’tYou don’t work
Hedoesn’tHe doesen’t work
Shedoesn’tShe doesn’t work
Itdoesn’tIt doesn’t work
Wedon’tWe don’t work
Youdon’tYou don’t work
Theydon’tThey don’t work

As you can see, only the pronouns of the 3rd person singular (he, she, it) are followed by does not, for all others do not use.

Interrogative form

The interrogative form of the Simple Present is obtained with the auxiliary do or does in front of the subject.

DoIDo I work?
DoyouDo you work?
DoesheDoes he work?
DoessheDoes sge work?
DoesitDoes it work?
DoweDo we work?
DoyouDo you work?
DotheyDo they work?

Training of the WHY-Questions

The Wh – questions (questions that use adjectives and interrogative pronouns like What, Where, Why, When, Which, Who) are formed by putting the adjective or interrogative pronoun Wh – at the beginning of the interrogative phrase. Here are some examples:

AffirmativeInterrogativeWHY QUESTIONS
They workDo they work?Why do they work?
You studyDo you study?What do you study?
She drivesDoes she drive?Which car does she drive?