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.
I don't work on the weekend. (present
I didn't work last weekend. (past
He doesn'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).
They don't have any money. (present
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.
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
I didn't go to work yesterday.
She didn't take the bus to work.
Separating the contraction creates emphasis
I did not want to
do the dishes last night. I do not want to
do them now!
He does not have his
license! He never did get it!
Please, do not put that
hot pan on the counter!
Never put "did" + ____ing
did going to work last night. (incorrect)
He went to work last night. ( correct )
Avoid bad American grammar!
don't go to work on Sunday. (She doesn't go to work on Sunday.)
don't matter to me. (It doesn't matter to me.)
don't know. (He doesn't know.)