To Do and To Have: Forms, Uses and Examples

Overview

Two of the most versatile verbs in English are to do and to have. Both verbs serve a double role: each functions as a main verb with its own meaning, and each functions as an auxiliary verb that helps form other tenses, questions, and negatives. Understanding when each verb is acting on its own and when it is supporting another verb eliminates a large number of common errors involving word order, negatives, and question formation.

The Verb To Do as a Main Verb

When to do functions as a main verb, it expresses the performance of an action, task, or activity.

In the present tense, to do takes the form do for all subjects except the third person singular, which takes does. In the past tense, all subjects use did.

The Verb To Do as an Auxiliary Verb

As an auxiliary verb, to do supports the main verb by forming questions and negatives in the simple present and simple past tenses.

In questions, do or does moves to the front of the sentence before the subject, and the main verb returns to its base form.

In negative sentences, do not, does not, or did not appears between the subject and the main verb, which again stays in its base form.

The contracted forms are standard in informal speech and everyday writing: don't, doesn't, and didn't.

The Verb To Have as a Main Verb

When to have functions as a main verb, it expresses possession, relationships, experiences, or states.

In the present tense, to have takes the form have for all subjects except the third person singular, which takes has. In the past tense, all subjects use had.

To have also appears in fixed expressions where it describes experiences or events rather than possession.

The Verb To Have as an Auxiliary Verb

As an auxiliary verb, to have forms the perfect tenses by combining with the past participle of the main verb.

In the present perfect tense, have or has precedes the past participle to describe actions with a connection to the present.

In questions and negatives, to have inverts directly with the subject or takes not immediately after it. No additional auxiliary is needed.

The past perfect tense, which uses had with a past participle, is covered in the B1 lesson on Past Perfect Tense.

Comparing To Do and To Have as Auxiliaries

Both verbs serve as auxiliaries, but they are not interchangeable — their functions apply to entirely different tenses and structures.

The clearest test is tense. If the sentence is in the simple present or simple past and uses a main verb other than to be, the auxiliary is to do. If the sentence is in a perfect tense, the auxiliary is to have.

Common Mistakes to Avoid

Mistake 1: Using Do or Does with To Have in Perfect Tenses

Learners who are accustomed to using to do as an auxiliary sometimes apply it to perfect tense questions and negatives, where it does not belong.

Mistake 2: Forgetting Does and Did with Third Person Singular

In the simple present tense, to do changes to does for third person singular subjects. In the simple past, did applies to all subjects.

Mistake 3: Using Have Instead of Has in the Third Person

When to have is the main verb or auxiliary in the present tense with a third person singular subject, has is required.

Mistake 4: Keeping the Main Verb in Past Form After Did

When did is used as an auxiliary, the main verb that follows must return to its base form. Keeping the main verb in its past form produces a double past marking.

Mistake 5: Omitting the Auxiliary in Questions

In many languages, questions are formed by intonation alone, without changing word order. English requires the auxiliary verb to move before the subject.

Mistake 6: Confusing Have Got and Have

Have got and have share the same meaning when expressing possession in the present tense, but they follow different grammar rules. Have got cannot be used in the past tense, cannot take do as an auxiliary, and is more common in British English. Mixing the patterns produces errors.

Practice Exercises

Exercise 1: Main Verb or Auxiliary?

Identify whether the bold verb is functioning as a main verb or an auxiliary verb. Write "main" or "auxiliary" for each sentence.

1. She has three siblings.
2. Do you enjoy cooking?
3. They have been waiting for an hour.
4. He did the laundry this morning.
5. We do not agree with the decision.
6. She has finished all her tasks.

Exercise 2: Choose the Correct Form

Choose the correct word from the brackets to complete each sentence.

1. He ___ (do / does) not eat meat.
2. ___ (Have / Has) she called you yet?
3. They ___ (did / done) not expect that outcome.
4. My father ___ (have / has) a small business.
5. ___ (Do / Did) you visit the museum last weekend?
6. We ___ (have / has) lived here for ten years.

Exercise 3: Form the Question

Rewrite each statement as a question using the correct auxiliary verb.

1. She has finished the project.
2. They do yoga every morning.
3. You have a meeting today.
4. She did the report by herself.
5. He has worked here for two years.

Exercise 4: Correct the Mistake

Each sentence contains one error related to to do or to have. Rewrite the sentence correctly.

1. Did you went to the party last night?
2. She have a lot of experience in this field.
3. Do you have visited Paris before?
4. He don't like working late.
5. They hasn't made a final decision yet.

Summary

Knowing which verb is acting as the main verb and which is acting as the auxiliary is the key to forming correct questions, negatives, and perfect tenses in English.