DO / DOES / DID | ENGLISH QUIZ | WHAT'S THE DIFFERENCE? | NS

The helping verbs "do," "does," and "did" are used in different ways depending on the tense of the sentence and the subject.
1. "Do" is used in present simple tense for plural subjects (e.g., "they," "we," "you") and for singular subjects (except third person singular) to form questions and negatives.
Positive: I/You/We/They do
Negative: I/You/We/They do not (don't)
Question: Do I/you/we/they?
2. "Does" is used in present simple tense for third person singular subjects (e.g., "he," "she," "it") to form questions and negatives.
Positive: He/She/It does
Negative: He/She/It does not (doesn't)
Question: Does he/she/it?
3. "Did" is used in past simple tense for all subjects (I, you, he/she/it, we, they) to form questions and negatives.
Positive: I/You/He/She/It/We/They did
Negative: I/You/He/She/It/We/They did not (didn't)
Question: Did I/you/he/she/it/we/they?
Here are some examples:
Present Simple:
Positive: I play tennis.
Negative: She does not (doesn't) play tennis.
Question: Do you play tennis?
Past Simple:
Positive: We went to the park.
Negative: He did not (didn't) go to the park.
Question: Did they go to the park?