subject + do/does + not + base verbUse do with I/you/we/they and does with he/she/it. The main verb stays in base form.
Do / Does / Did Support
A1Use do, does, and did to build negatives, yes/no questions, and short answers. After them, the main verb stays in base form.
What you'll learn
- Choose do or does in present simple negatives and questions.
- Use did for all subjects in past simple negatives and questions.
- Keep the main verb in base form after do, does, and did.
- Build negatives with do not, does not, and did not.
- Build yes/no questions by moving the helper verb to the front.
- Answer with short forms like Yes, I do. or No, they didn't.
Structure
Do/Does + subject + base verb + ?Start the yes/no question with Do or Does. The main verb stays bare.
subject + did + not + base verbUse did not for all subjects in the past. The main verb does not change to past form.
Did + subject + base verb + ?Did works with all subjects. Put it first and keep the main verb in base form.
Yes, subject + do/does/did. / No, subject + don't/doesn't/didn't.Repeat the helper verb from the question. Do not add the main verb in a short answer.
Build a sentence
Time
Subject
Verb
Doesshego
Does she go on Fridays?
Present question with she needs Does.
When to use
Present negatives
Say that something is not true now or as a habit: Maria does not eat meat. We do not work on Sundays.
Present questions
Ask about routines and facts: Do they live nearby? Does Lisa need help?
Past negatives
Say that something did not happen: Tom did not call last night. Anna didn't finish the report.
Past questions
Ask if something happened before now: Did you see Maria yesterday? Did the bus arrive on time?
Markers
every dayusuallyon Fridaysyesterdaylast nighttwo days ago
Common mistakes
Wrong
You like coffee?
Correct
Do you like coffee?
Present simple yes/no questions need do or does at the front.
Wrong
He do like tea?
Correct
Does he like tea?
With he, she, and it, use does, not do.
Wrong
She doesn't works on Fridays.
Correct
She doesn't work on Fridays.
After does, the main verb must stay in base form.
Wrong
Did Tom went home?
Correct
Did Tom go home?
Did already marks the past, so the main verb returns to base form.
Wrong
She did go home?
Correct
Did she go home?
In a yes/no question, the helper verb goes before the subject.
Common misconceptions
❝ After did, the main verb should also be in the past form. ❞
Only did shows the past here. The main verb stays in base form: Did she go? not Did she went?
❝ A short answer needs the full main verb. ❞
Short answers use the helper verb only: Yes, he does. No, they didn't.
Skills in this rule (7)
USE_DO_DOES_IN_PRESENTw5Use do or does for present simple negatives and questions
Use do with I, you, we, they and does with he, she, it. This helper verb builds the negative and the yes/no question in the present.
USE_DID_IN_PASTw5Use did for past simple negatives and questions
Use did for all subjects in past simple negatives and yes/no questions. The helper verb carries the past meaning.
KEEP_MAIN_VERB_BASEw5Keep the main verb in base form after do, does, and did
After do, does, or did, use the base verb: work, go, like. Do not add -s or use the past form on the main verb.
BUILD_NEGATIVES_WITH_NOTw4Build negatives with do not, does not, and did not
Put not after do, does, or did to make the sentence negative. The main verb stays in base form after the helper verb.
BUILD_YES_NO_QUESTIONSw5Build yes/no questions with do, does, and did
Start the question with do, does, or did, then add the subject and the base verb. Use this pattern for present and past yes/no questions.
SHORT_ANSWERS_WITH_DOw3Answer yes/no questions with short answers
Use the same helper verb in the short answer: Yes, I do. No, he doesn't. Yes, they did. No, she didn't.
PICK_TIME_MARKERSw3Use present and past time markers to choose the helper verb
Markers like every day point to do or does; markers like yesterday or last night point to did. The marker helps you choose present or past.