Do and does are used when we ask yes/no questions.
We use do when the subject is I, you, we or they.
We use does when the subject is he, she or it.
Did is the past tense (= dåtid) of both do and does.
Important: do not add an -s to the main verb when using do/does/did.
Do | Does | Did |
Do I know you? | Does he work with you? | Did I meet him? |
Do you like school? | Does she eat meat? | Did we win the match? |
Do we like candy? | Does the cat sleep at night? | Did he sleep well? |
Do they want to leave? | Does it matter? | Did she vote? |
Negatives
The negative form of do is do not (don’t).
I do not like tennis.
I don’t like tennis.
The negative form of does is does not (doesn’t).
She does not like tennis.
She doesn’t like tennis.
The negative form of did is did not (didn’t).
I did not know the answer.
I didn’t know the answer.