"Do" present tense and "Did" past tense

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Do present tense and Did past tense

Present Tense Negative

do + not + main verb

Singular	Plural
I do not ___ l I don't ___ l	We do not ___l We don't ___l
You do not ___l You don't ___l	You do not ___l You don't ___ l
He does not ___ l He doesn't ____l
She does not ____l She doesn't ____ l	They do not ___ l They don't ___l
It does not ___l It doesn't ____l

Past Tense Negative

did + not + main verb

Singular	Plural
I did not ____l I didn't _____l	We did not ____ l We didn't ____ l
You did not ____l You didn't ____ l	You did not ____ l You didn't ____l
He did not ____l He didn't _____l
She did not ____ l She didn't ____ l	They did not ____l They didn't ____ l
It did not ____ l It didn't ____l

The verb "do" is a helping verb. We add it to the
simple form of a verb to make questions and negatives in the present
tense and the past tense. l

Examples

I don't work on the weekend. (present tense negative). l

I didn't work last weekend. (past tense negative)l

He does n't like to go to the store. present tense negative

He didn't like to go to the store when he was younger. (past tense negative). l

They don't have any money. present tense negative

They didn't have any money last week. past tense negative

Note: "Do" is also used as a main verb for activities, such as housework, cleaning, studying, research, business, and shopping

Examples

I don't do the dishes every night. I didn't do the dishes last night

She doesn't do her grocery shopping at Cub. She didn't do her grocery shopping yesterday

They do not do their homework at the library. They didn't do their homework last night

Their company doesn't do business in Minnesota. They never did business here

The past tense form of "do" is "did." Did + not = didn't

Examples

I didn't go to work yesterday

She didn't take the bus to work

Separating the contraction creates emphasis

Examples

I did not want to do the dishes last night. I do not want to do them now! l

He does not have his license! He never did get it! l

Please, do not put that hot pan on the counter! l

Never put did + ____ing

He did going to work last night.incorrect

He went to work last night. correct

Avoid bad American grammar! l

She don't go to work on Sunday

It don't matter to me

He don't know

» Using "that" to make a clause
» The Past Conditional
» The Simple Past
» The Present Conditional
» "Ancient Greeks and Romans"