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does and did are forms of do. Doesis the third person singular form and did is the past form

The auxiliary do goes with the basic form of the main verb:

I do play football, I don't play football,

or is used to form a yes/no question;

Do you play football? Does he play football? Did he play football?

Do is mainly used to form questions and negative sentences.

Negative forms are: don't doesn't didn't.

I like ice cream - I don't like ice cream

He likes ice cream - He doesn't like ice cream

I went to school - He didn't go to school. -- notice in this sentence the auxilary verb is in the past form (and negative) but the main verb is in the base form.

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