when to use do ,does and did.

'Do' is an action word as well as an auxiliary.
For example: I have to do my work. (action word)
I do not know you. (auxiliary verb)
'Does' is used with present simple third person(he, she, it)
For example: He does his work.
'Did' is the past tense form of 'do' and 'does'.
They did their work.
She did her work.

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