Camden Town, London

Do and does are used when we want to ask yes/no questions.

Its only used in the present simple tense.

We use do or does depending on the subject.

Did is used in the past tense.

Do/does+ subject + infinitive

Does she like sport? Yes, she does.

Do you like sport? Yes, I do.

Do we like sport? Yes we do.

Do they like sport? Yes they do.

Do

We use do when the subject is I, you, we or they.

Do I know you?
Do you come from England?
Do we have to cut the grass?
Do they want to come with us?

Does

We use does with third person singular pronouns i.e when the subject is he, she or it.

Does he work with you?
Does she have a car?
Does it snow in winter?

Past Tense

Did is the past form of both do and does.

Did I pass the exam?

Did you enjoy your holiday?

Did he call you?

Did they pass the exam?

Negatives

The negative form of do is do not. In spoken English it is common to use the contracted form of do not which is don't.

I do not like sport

I don't like sport.

The negative form of does is does not. Also, in spoken English we usually use the contracted form of does not which is doesn't.

He does not like sport.
He doesn't like sport.

The negative form of did is did not or when speaking, didn't.

I did not know you were coming.
I didn't know you were coming.

What do you do? = What’s your job?

Remember:

DO– I/we/you/they           Do they like music?

DOES – he/she/it               Does he like music?

However, if a question word such as who, when, where, why, which or how is used in the question, you cannot use the short answers above to respond to the question.