A Complete Guide to English Modal Verbs: Usage and Examples

What Are Modal Verbs?

Modal verbs are helper verbs. They change the mood of a main verb – they don't do the action themselves. Words like can, must, and should are modals. They're everywhere in English, and they can be tricky because one modal often has more than one meaning.

This English modal verbs guide will walk you through the most common ones, what they mean, and how to use them naturally.

The Core Modal Verbs

There are nine main modals: can, could, may, might, must, shall, should, will, would. Plus a couple of close cousins like ought to and need to.

Each one can express different ideas depending on context. Let's break them down by function.

Ability – Can and Could

• Can = present ability. I can swim.
• Could = past ability. I could run fast when I was younger.
  Also polite request: Could you pass the salt?

Permission – Can, May, Could

• Can is the most casual. Can I borrow your pen?
• May is more formal. May I come in?
• Could is polite and a bit softer. Could I use your phone?

In everyday speech, can wins. In writing or formal settings, may sounds better.

Obligation – Must, Should, Ought to

• Must = strong obligation (internal or rule). You must wear a seatbelt.
• Have to (not a modal but often grouped) = external obligation. I have to pay taxes.
• Should / Ought to = advice or weak obligation. You should eat more vegetables.

One thing learners often mix up: must not means it's forbidden. Don't have to means it's not necessary. Big difference.

Possibility and Certainty – May, Might, Could, Must

This is where modals get fun. They let you express how sure you are.

• Must = very sure (logical conclusion). She left early – she must be home by now.
• May = possible, but not certain. It may rain later.
• Might = less certain than may. I might go to the party.
• Could = possibility in a general sense. That could be true.

Here's a quick visual guide to how certain each modal sounds:

Advice and Suggestions – Should, Ought to

We already saw should. It's the go‑to for giving advice.
You should see a doctor.
Ought to is a little stronger and more formal. You ought to apologize.

Predictions and Promises – Will, Shall

• Will = future prediction or promise. I'll call you tomorrow.
• Shall = formal future (mostly British) or suggestion. Shall we go?
  In American English, shall is rare except in legal or very polite questions.

Politeness – Would

Would softens requests and offers.
Would you like some coffee?
I would prefer not to go.

Two Common Mistakes

1. Using a modal with "to"
Modals never take to (except ought to and need to). Say I can go, not I can to go.

2. Using two modals together
You can't stack modals. I will can go is wrong. Instead: I will be able to go. Use helper phrases.

Quick Practice

Try to choose the correct modal for each sentence:

1. You _______ (must / can) be tired after that long flight. (logical conclusion)
2. _______ (May / Must) I open the window? It's stuffy. (permission, polite)
3. I _______ (could / should) speak French when I was a kid, but I forgot. (past ability)

(Answers: 1. must, 2. May, 3. could)

Your Turn

Modals take time to feel natural. Pay attention to how native speakers use them in movies or podcasts. Over time, your ear will guide you.

Want to check your overall English level? At English Measure, you can test your reading, listening, writing, and speaking for free. It only takes a few minutes, and you'll get instant feedback.

👉 Take the free English test now