Do and Does are auxiliary verbs used in the simple present.

QUESTIONS

Questions with verbs in the simple present use the auxiliary
verb “DO”.

Structure

Do/Does   +   Subject   +   Base Verb

Examples:
  • Do you like pizza?
  • Does she play baseball?

Answers

The answers to do/does questions are always "yes" or "no".  
This is why they are Yes/No Questions.  

Question:        Do you like chocolate?
Answer:           Yes I do.
                        No I do not.

Question:        Does she have a brother?
Answer:           Yes she does.
                        No she does not.


NEGATIVES

Negative sentences in simple present use do or does.

Structure

Subject        +        Do/Does        +        Not        +        Verb

Examples:
  • I do not like hockey
  • She does not live in Brazil.

Contractions

Do not  =  Don't        
Does not  =  Doesn't

Examples:
  • They don't have a dog.
  • He doesn't want a drink.


VERB STRUCTURE

The verbs after "do" and "does" are always in the base form.

Examples:
  • She plays hockey.
  • She does not play hockey.

The subject of the sentence only changes the "do" or the
"does".  The verb is always a base verb.

  • Does she live in New York?
  • Do they live in New York?

  • He does not have a brother.
  • They do not have a brother.
Simple Present Tests

Do & Does

Business English
Practice Do/Does with these tests:

Do/Does Questions Test

Do/Does Questions Test 2