What Are Auxiliary Verbs? Easy Guide for Kids

Auxiliary verbs help main verbs express tense, questions, negatives, possibility, ability, and other grammatical meanings. Learning them helps children understand how verb phrases work and makes it easier to identify the main verb in a sentence.

You’ll learn the three primary auxiliary verbs be, have, and do, common modal auxiliaries, how auxiliaries work in questions and negatives, and how to recognize them in different sentences.

What Does an Auxiliary Verb Do?

An auxiliary verb helps a main verb add grammatical meaning.

For example:

She is reading.

They have finished.

Noah can swim.

In each example, the auxiliary supports another verb.

The basic idea is:

auxiliary verb → helps the main verb

main verb → carries the central action or state

For example:

She is reading.

is = auxiliary verb

reading = main verb

The Three Primary Auxiliary Verbs

English has three primary auxiliary verbs:

• be
• have
• do

Each one performs a different job.

Be

Forms of be include:

• am
• is
• are
• was
• were
• be
• been
• being

As an auxiliary, be commonly helps form continuous verb phrases.

Examples:

She is reading.

They are playing.

Noah was sleeping.

We were studying.

In these examples:

is, are, was, were = auxiliaries

reading, playing, sleeping, studying = main verbs

Auxiliary be can also help form passive structures.

For example:

The window was broken.

The cake was baked this morning.

For kids, the most important point is that forms of be can help another verb.

Have

Forms of have include:

• have
• has
• had

As an auxiliary, have helps form perfect verb phrases.

Examples:

She has finished her work.

They have eaten lunch.

We had left before noon.

Noah has written a story.

In these examples:

has, have, had = auxiliaries

finished, eaten, left, written = main verbs

The common pattern is:

have / has / had + past participle

Do

Forms of do include:

• do
• does
• did

Auxiliary do often helps form questions, negatives, and emphasis.

Questions:

Do you like apples?

Does Mia play football?

Did they finish the work?

Negatives:

She does not like milk.

We do not need help.

Noah did not arrive early.

Emphasis:

I do like this book.

She does want to help.

In these examples, do, does, and did support the main verb.

Auxiliary Verb vs Main Verb

Auxiliary verbs and main verbs perform different jobs.

Compare:

Mia reads every night.

Here, reads is the main verb and works alone.

Now compare:

Mia is reading.

Here:

is = auxiliary

reading = main verb

The simple difference is:

auxiliary → supports

main verb → carries meaning

When Be, Have, and Do Change Jobs

The words be, have, and do are not always auxiliaries. They can also work as main verbs.

Be as Main or Auxiliary

Main/linking verb:

She is happy.

Here, is is the main linking verb.

Auxiliary:

She is running.

Here:

is = auxiliary

running = main verb

Have as Main or Auxiliary

Main verb:

I have a bicycle.

Here, have means possess.

Auxiliary:

I have finished my homework.

Here:

have = auxiliary

finished = main verb

Do as Main or Auxiliary

Main verb:

I do my homework after dinner.

Here, do carries the main action.

Auxiliary:

Do you like apples?

Here:

do = auxiliary

like = main verb

Therefore, children should identify a verb by its job in the sentence rather than memorizing it as always main or always helping.

Modal Auxiliary Verbs

Modal auxiliary verbs are another group of helping verbs.

Common modal auxiliaries include:

• can
• could
• may
• might
• will
• would
• shall
• should
• must

These verbs add meanings such as:

• ability
• possibility
• permission
• prediction
• advice
• obligation

Examples:

Mia can swim.

We may leave early.

You should study.

They will arrive soon.

Noah must finish his work.

The modal auxiliary comes before the main verb.

For example:

She can draw.

can = modal auxiliary

draw = main verb

Primary vs Modal Auxiliary Verbs

Primary and modal auxiliaries are both helping verbs, but they belong to different groups.

The main distinction is:

primary auxiliaries → be, have, do

modal auxiliaries → can, could, may, might, will, would, shall, should, must

Auxiliary Verbs in Questions

Auxiliary verbs often help form questions.

Examples:

Do you like apples?

Is she working?

Have they finished?

Can Noah swim?

Will Mia join us?

In many questions, the auxiliary comes before the subject.

Compare:

She is working.

Is she working?

Similarly:

They have finished.

Have they finished?

The auxiliary helps change the sentence into a question.

Auxiliary Verbs in Negative Sentences

Auxiliaries also help form negative sentences.

Examples:

She does not like milk.

They are not playing outside.

We have not finished.

Mia cannot swim today.

Noah will not come tomorrow.

The auxiliary works with not to make the sentence negative.

For example:

She likes milk.

becomes:

She does not like milk.

When a Verb Phrase Has More Than One Auxiliary

A verb phrase can contain more than one auxiliary before the main verb.

For example:

They may have finished.

Auxiliaries:

• may
• have

Main verb:

• finished

Another example:

She might have been waiting.

Auxiliaries:

• might
• have
• been

Main verb:

• waiting

One more:

Noah could have been sleeping.

Auxiliaries:

• could
• have
• been

Main verb:

• sleeping

Even with several auxiliaries, one main verb carries the central meaning.

How to Find the Auxiliary Verb

A simple method can help.

First, find the verb or verb phrase.

Next, identify the verb that carries the main action or state.

Any verb helping that main verb is an auxiliary.

For example:

She has been reading.

Verb phrase:

has been reading

Main verb:

reading

Auxiliaries:

has, been

Another example:

Noah can swim.

Verb phrase:

can swim

Main verb:

swim

Auxiliary:

can

Now compare:

Mia reads every night.

There is only one verb.

So reads is the main verb, and there is no auxiliary.

Auxiliary Verbs in Sentences

The following examples show auxiliaries working with main verbs.

These examples show how auxiliaries support the main verb in different ways.

Common Auxiliary Verb Mistakes

For example:

She is running.

Here, is is an auxiliary.

By contrast:

She is happy.

Here, is is the main linking verb.

Similarly:

I have a bicycle.

Here, have is the main verb.

However:

I have finished my work.

Here, have is an auxiliary.

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