do

do is on the Basic English 850 List.

division - do - dog

do is one of the 1000 most common headwords.

divide - do - doctor

Verb

Plain form
do

Plain present
do

Third person singular
does

Past
did

Negative

don't

Contraction

Plain present
None

Third person singular
's

Past
'd

(auxiliary) Do is an auxiliary verb. It is used in questions, negative statements, short answers, and for emphasis when there is no other auxiliary.
- Questions
  Where do you live?
  
  When did you start learning English?
  
  "Does John live here?"
- Short answer
  "Yes, he does."
  
  "No, I don't."
- Negative statements
  They don't live here. [don't = do not]
  
  We do not want to fight.
  
  Jared did not tell me he had such a pretty sister.
- Emphasis (do not use this too much)
  You think I don't have a brother, but I do!
  
  She does enjoy swimming in the pool.
We sometimes use do in place of a different verb, such as when we do not know what an activity is, or we do not want to say it again:
What is he doing?

Mary eats more than John does.

Plain form
do

Third-person singular
does

Past tense
did

Past participle
done

Present participle
doing

When you do something, you perform, complete or work on a task.
Mary is doing her homework.

We all did the cleaning together.

I've got a lot to do.

"What do you do?" - "I'm a baker."
To succeed or progress
"How did John do in the tennis match?" - "He lost."

"How is your leg doing?" - "Oh, it feels much better, thank you."
To write or draw something, usually in a short time
He did a picture of a tree.

He did an essay on Shakespeare.

For the uses of make and do, see page: make and do

A do refers to a hairstyle.
- Synonyms: hairstyle, hairdo, style and styling
She came to work with a new do.
Correct actions. (almost always in plural and generally with "don'ts")
- Antonym: don'ts
Willy will tell you all the dos and don'ts.