Helping Verbs Explained- Khan Academy's Complete Guide

What Are Helping Verbs, Exactly?

Helping verbs are words that support the main verb in a sentence. They don't act alone. They assist the main verb by adding information about tense, voice, mood, or aspect. Without them, you'd be stuck with bare, flat sentences like "She walks to school" instead of "She is walking to school."

The grammar world calls them auxiliary verbs. Same thing. You can use either term and nobody will notice.

Here's the hard truth: if you're writing or speaking English, you're using helping verbs whether you realize it or not. They're woven into the language so deeply that most people identify them only when grammar class forces the issue.

The Two Main Types of Helping Verbs

Not all helping verbs work the same way. They split into two categories:

Primary Helping Verbs

These are the big three: be, have, and do. They do the heavy lifting in English grammar.

Be — forms progressive tenses and passive voice (is running, was eaten)
Have — forms perfect tenses (has eaten, had finished)
Do — forms negatives and questions (does not know, did she call?)

Modal Helping Verbs

Modals are a separate breed. They express possibility, permission, obligation, ability, or prediction. They're smaller words, but they carry serious grammatical weight.

Here's the complete modal list:

Can
Could
May
Might
Shall
Should
Will
Would
Must

Complete List of Helping Verbs

Here's everything in one place. Don't memorize it. Just recognize it when you see it.

Category	Helping Verbs	Primary Function
Primary: Be	am, is, are, was, were, be, being, been	Continuous actions, passive voice
Primary: Have	has, have, had	Completed actions
Primary: Do	does, do, did	Questions, negatives, emphasis
Modals	can, could, may, might, shall, should, will, would, must	Possibility, permission, obligation
Semi-modals	ought to, had better, dare, need	Varying degrees of obligation/ability

How Helping Verbs Work in Sentences

Helping verbs sit in front of the main verb. That's the basic rule. The main verb follows them, usually in its base form, past participle, or -ing form.

Look at these examples:

She is reading a book. (is + reading = present continuous)
They have finished dinner. (have + finished = present perfect)
He can swim fast. (can + swim = ability)
You should study harder. (should + study = recommendation)

The Verb Phrase Rule

When a helping verb teams up with a main verb, they form a verb phrase. This phrase acts as a single unit in a sentence. The helping verb doesn't change meaning on its own—it modifies how the main verb behaves.

Example: "She will travel tomorrow."

The verb phrase is "will travel." "Will" tells you when the action happens (future). "Travel" tells you what the action is.

Modal Helping Verbs: What They Actually Mean

Modals confuse people because their meanings shift depending on context. Here's what each one actually communicates:

Can / Could — Ability and Possibility

Use can for general ability in the present. Use could for past ability or polite requests.

I can speak three languages. (present ability)
She could play piano at age five. (past ability)
Could you pass the salt? (polite request)

May / Might — Possibility and Permission

May sounds formal. Might sounds slightly more uncertain. Both work for permission and possibility, but speakers often swap them without caring about the technical difference.

You may leave early. (permission)
It might rain tomorrow. (possibility)

Will / Would — Future and Condition

Will predicts. Would speculates, conditions, or softens requests.

I will call you later. (future intention)
If I would have known, I would have helped. (conditional)
Would you like some coffee? (polite invitation)

Shall, Should, Must — Obligation and Necessity

Shall is fading from everyday speech, mostly surviving in formal writing or questions. Should recommends. Must demands.

We shall overcome. (formal/archaic determination)
You should see a doctor. (recommendation)
You must be 18 to vote. (requirement)

Common Mistakes People Make

Double Negatives

Modals already contain negative meaning in their structure. Adding another negative creates a double negative, which technically means the opposite of what you intend.

Wrong: "You must not never forget this."

Right: "You must never forget this."

Or: "You must not forget this."

Using "Can" When "May" Is Correct

Strict grammarians will tell you can refers to ability and may refers to permission. In reality, most native speakers use "can" for both. But in formal writing—exams, professional emails—stick with the distinction.

Can I go to the bathroom? (informal, accepted)
May I go to the bathroom? (formal, technically correct)

Leaving Out the Main Verb

Helping verbs need a partner. Don't leave the main verb stranded or implied too vaguely.

Wrong: "I can." (Can what?)

Right: "I can do it."

How to Identify Helping Verbs in Any Sentence

Follow this step-by-step process:

Find the main verb first. Ask yourself: what action is taking place? That's usually the last verb in the verb phrase.
Look for words before the main verb. These are your candidates for helping verbs.
Check if they modify the main verb. Do they indicate time, possibility, obligation, or completion?
Verify against the list. If the word fits one of the categories above, it's a helping verb.

Example: "She has been studying all night."

Breakdown: "studying" is the main verb (action). "Has been" sits before it and shows the action started in the past and continues. "Has" (primary) + "been" (primary) = helping verb phrase.

Getting Started: Practice Identifying Helping Verbs

Here's a practical exercise. Read each sentence and identify the helping verb(s) and the main verb:

They are going to the market.
He should have called earlier.
The report must be finished by Friday.
She does not agree with the decision.
We had already eaten when they arrived.

Answers:

Helping: are | Main: going
Helping: should have | Main: called
Helping: must | Main: be finished
Helping: does | Main: agree
Helping: had | Main: eaten

Why This Matters

You don't need to memorize every grammar rule to communicate effectively. But understanding helping verbs clarifies your writing and helps you avoid embarrassing mistakes in formal contexts.

When you know what a helping verb does, you can choose the right one. "Could have" vs. "would have" isn't just a grammar test—it's the difference between expressing regret and expressing a hypothetical situation.

That's it. You have what you need.