Do or does?
The -s moves. Once it sits on does, the verb after it goes back to its plain form.
The short answer
Use does with he, she, it and any single person or thing. Use do with I, you, we, they and anything plural. The verb after them never takes -s: does she work, not does she works.
Which one do you need?
| Subject | Form | Example |
|---|---|---|
| I, you, we, they, several things | do | Do they know? |
| he, she, it, one thing | does | Does he know? |
| any subject, past | did | Did they know? |
Practice the choice
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Getting your first question ready.
Side by side
Three sentences for each form, taken from the 1,242 sentences this drill uses. The answer is highlighted.
do
- When do you usually wake up in the morning?
- Who do your parents visit in that house next door?
- How do your siblings help with the household chores?
does
- When does your sister have her English class?
- Does it take you a long time to get ready in the morning?
- Does the pilot have to report to the tower before take-off?
Where the -s goes
In the present simple, he, she and it add -s to the verb: she works. Build a question or a negative out of that sentence and the -s jumps onto the auxiliary:
She works. → Does she work? → She doesn’t work.
One -s per verb phrase, and it sits on the first word. This single fact explains almost every error on this page.
Do as helper and do as verb
Do has two jobs, and both can appear in one sentence:
- Does he do his own cooking?
- I don’t do mornings.
The first do(es) builds the question or the negative. The second is the real verb, meaning to perform or carry out. When both are present, only the first changes form.
What do you do?
The most-used sentence of this shape in English, and it confuses learners precisely because both dos are there. It means “what is your job”:
- What do you do? — I’m a nurse.
- What does she do? — She teaches.
Emphatic do
Dropped into a positive statement, do adds force rather than grammar:
- I do like it. — contradicting someone who thinks you don’t
- She does know. — insisting, against doubt
It keeps the same agreement: do for I, does for she.
Do or be?
Do never helps be. If the verb in the positive sentence is is, am or are, the question and the negative are made without do:
- She is ready. → Is she ready? — not does she be
- They are late. → They aren’t late.
Question tags
The tag copies the auxiliary:
- He works here, doesn’t he?
- They don’t mind, do they?
If the statement has no auxiliary, the tag supplies do or does to match the subject.
Mistakes to avoid
Wrong: Does she works here? correct: Does she work here?
Only one word in the sentence carries the -s. Once does has it, the main verb drops back to its plain form.
Wrong: Do he like coffee? correct: Does he like coffee?
He is third person singular, so the auxiliary is does.
Wrong: Does everybody have a copy? correct: Does everybody have a copy?
This one is right. Everybody looks plural but counts as singular, so does is correct — a case people often change to do by mistake.
Wrong: What does he does? correct: What does he do?
The first does is the auxiliary, the second is the main verb do in its plain form.