DO/DOES/DID – QUESTION

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 he call you?
Did you enjoy it?