Auxiliary Verb DO



Auxiliary Verb DO :



DO – verb
DID – Past Tense
DONE – Past Participle
Doing – Present Participle
Does – Third Person Singular Verb
DO – Auxillary Verb


DO is used with another verb especially to form questions or negatives.

1. Do you like my new car?
2. He didn't answer.
3. Where do you live?


DO is used to strengthen or support another verb.

1. Do be careful.
2. Why didn't you tell me?
3. Do be quiet.


DO is used instead of another verb.

1. She likes it and so do I.
2. "You stepped on my toe".
3. "No, I didn't".
4. She writes novels, doesn't she?


DO is used to express disapproval also.

1. What was that man doing in that room?


DO is also used to emphasize the affirmative nature of a statement.

1. You do look ill.
2. I told her not to go, but she did go.


DO is used to avoid repetition of a previous ordinary verb.

1. Do you know him? Yes. I do.
2. He eats fish and so do I.
3. She cooks well. Yes. She does.
4. You met her. Didn’t you?


DO is not used with other auxiliary verbs.

1. Can you swim?
2. Have you seen Mary?


DO - auxiliary verb in affirmative sentences


DO is often used as an auxiliary verb in affirmative sentences.


1. Do you mind if I sit here? No. Do.
2. She said she'd help me and she did.
3. You do look nice today.
4. I do like you.
5. Do come in.
6. Why didn't you tell him?
7. I did tell him.
8. I don't have much contact with my family.
9. I do see my mother occasionally, though.


Auxiliary verb DO and ordinary verb DO together

1. Don't do it!
2. What did you do?
3. Do do some work. (infinitive)


The second DO is the infinitive of the ordinary verb DO which is used to talk about work, activity in general.


1. Do you like some coffee?

In this sentence, LIKE indicates some action.


2. Do you do any work?

In this sentence, DO indicates some action.


3. What do you do there? The DO makes a question.
4. Why do you go there? The DO / GO indicates action.

When we talk about an activity without saying exactly what it is, we use DO.

1. Do some work.
2. I often don't know what to do.
3. What are you doing?
4. I like doing anything.

Note :

1. I am always doing this mistake. (Not correct)
2. I am always making this mistake. (correct)

In questions and negatives, DO can be used twice….Once as an ordinary verb and once as an auxiliary verb.

1. When do you do your exercise?
2. We don't do much work on Saturdays.

Auxiliary Verb DO



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