We use do + subject + base form of the verb in all persons except for the third person singular. We use does + subject + base form of the verb in this person.

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​EXAMPLES

​Do you like football?

Does he like tennis?

Do I eat this dessert?

Does it float?

Does he know him?​

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YES + , + SUBJECT + DO/DOES

NO + , + SUBJECT + DON'T/DOESN'T

Even if the answer is no more than Yes or No, you need to add the auxiliary of the sentence to the structure.

ANSWERS TO INTERROGATIVE SENTENCES IN THE PRESENT SIMPLE TENSE 

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​EXAMPLE

​Mary has a car but do you have a car? – No, I don’t.