Do

'Do' can be an auxiliary verb or a main verb. We can also conjugate it. In this lesson, we will learn more about it.

How to Use the Verb "Do" in the English Grammar

The verb do is used very often in English grammar. The verb do is used as an auxiliary verb or a main verb. In this lesson, we will learn all about it.

Functions of 'Do'

Auxiliary Verb
Main Verb

1. 'Do' as an Auxiliary Verb

Use

Do as an auxiliary verb has no specific meaning and it is used to help make a question or a negation. Have a look:

Do as an auxiliary verb is used in simple present or simple past tense to make a question or negation. Have a look:

I work hard. → Do you work hard?/ I do not work hard.

'Work' is the simple present tense, so 'do' is needed to make a question or negation.

I tried to talk to him. → Did you try to talk to him?/ I did not try to talk to him.

'Tried' is the simple past tense, so 'did' is used.

Do is used to emphasize the verb. For example:

I do know what I say.

The speaker emphasizes what they know.

He did go there. I witnessed it.

Tip

The verb to be is the only main verb that does not take the auxiliary verb 'do' in questions or negations. Look:

She is a doctor. → Is she a doctor?/ She is not a doctor.

Position in a Sentence

The auxiliary verb do mainly comes before the main verb. Remember that in short answers, it can be used alone. For example:

Do you know what I mean?

I don't know.

A : Do you understand?

B : Yes, I do.

Contraction & Negation of 'Do'

This table shows some examples of the negation and negative contractions of the verb do:

	negation	negative contraction
I do	I do not	I don't
she does	she does not	she doesn't
they do	they do not	they don't
I did	I did not	I didn't

For example:

I didn't go there.

She doesn't think like that.

2. 'Do' as a Main Verb

Use

Do as the main verb contributes to the meaning of the sentence. Take a look:

Do as the main verb is a dummy verb in this structure: do + noun. Look:

I do my homework.

I did chemistry at university.

Do as a main verb means 'to perform, to act.' For example:

Do what you want.

What is he doing in the kitchen?

Position in a Sentence

The verb do as the main verb acts like other main verbs and expresses the action of the doer. To make a question or negation, we still need the auxiliary verb 'do.' For example:

I do my laundry. → I don't do my laundry./ Do you do your laundry?

The underline words are auxiliary verbs.

Remember that modal verbs and the auxiliary verb have are prioritized when we have the main verb do in a sentence. For example:

I will do chemistry at university. → Will you do chemistry?/ I will not do chemistry.

She had done her homework. → Had she done her homework?

Conjugation

Here is the conjugation of the verb 'do.' Look:

present

singular	plural
I do	we do
you do	you do
he/she does	they do

past

singular	plural
I did	we did
you did	you did
she/he did	they did

past participle

singular	plural
I have done	we have done
you have done	you have done
she/he has done	they have done

progressive

singular	plural
I am doing	we are doing
you are doing	you are doing
she/he is doing	they are doing

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