Modals

Why This Matters

Think about how differently these three sentences land:

• “Give me your pen.”
• “Can you give me your pen?”
• “Could you give me your pen, please?”

The action is the same — you want a pen. But the first sounds like an order, the second sounds normal, and the third sounds polite. What changed? Just one little word: can, could. These small helper words are called modals, and they quietly carry your attitude — whether you are ordering, asking, allowing, guessing or advising.

Valli, the little girl in “Madam Rides the Bus”, is full of these attitudes. She thinks “I can travel alone.” She wonders “Will the conductor let me?” She decides “I must save my money.” Every one of those is a modal doing its job. Once you can feel what each modal means, you can say exactly what you intend — not too rude, not too unsure. This is a skill you will use every single day of your life, in English, far beyond the exam.

The Big Idea

A main verb tells you the action — run, eat, go, finish. A modal is a helper verb placed in front of the main verb to add an attitude to that action.

A modal does not change what happens. It changes how you feel about it happening — can you do it, are you allowed to do it, should you do it, must you do it, might it happen? The modal carries the meaning; the main verb carries the action.

So “I go” is just a plain fact. But “I can go” (I’m able to), “I may go” (I’m allowed to / maybe I will), “I should go” (it’s the right thing), “I must go” (I have no choice) — each modal paints the same action with a different feeling.

Before we go further, let’s pin down two small grammar words you’ll see throughout this unit.

The eleven modals you need for Class 10 are: can, could, may, might, will, would, shall, should, must, ought to, need, dare.

Let’s Break It Down

What modals are, and their one fixed rule

Here is the best news about modals: their grammar is extremely simple, because it never changes. A modal is always followed by the base verb (V1) — and that’s it.

The picture below sums up the entire rule in one card. Learn this one shape and you will never get modal grammar wrong.

Tap to zoom

So the form is:

• modal + base verb — She can sing. (not sings)
• no “to” in between — He must go. (not must to go)
• no “-s” for he/she/it — It might rain. (not mights rain)
• same for all subjects — I / you / he / we / they all say can swim.

But why is the rule this strict? This is exactly the kind of “given” that a textbook just states. Let’s understand why it must be so.

The modal is already doing all the grammatical work. In a normal sentence, the verb changes to fit the subject — “she sings”, “he goes”. That “-s” is the verb’s way of agreeing with she/he/it. But once a modal steps in front, the modal becomes the part that “agrees”, and modals simply have no “-s” form at all (there is no such word as “cans” or “mights”). So the main verb is freed from its agreement job and drops back to its plain base form. Two verbs cannot both carry the grammar — the modal takes over, the main verb relaxes. That is why “She can sings” feels doubled-up and wrong: you tried to make both words agree.

The “to” is banned for the same reason. Words like want and need to take “to + verb” (“I want to go”). But a modal is a different kind of helper — it bolts straight onto the base verb with nothing in between. The modal is not the verb “to allow” or “to be able”; it is the helper itself, so no bridge word is needed.

Let’s apply the rule on a tricky sentence.

Modals of ABILITY and PERMISSION — can, could, may, might

Ability means being able to do something. Permission means being allowed to do something. Two different ideas — and some modals can do both.

• can = ability now (“I can swim”) OR informal permission (“You can go”).
• could = ability in the past (“When I was five I could swim”) OR polite permission (“Could I go?”).
• may = formal permission (“You may leave now”).
• might = very formal or hesitant permission (rare in speech).

A simple test: if the sentence is about being skilled enough, it’s ability. If it’s about getting someone’s okay, it’s permission.

The map below shows which modals carry which meaning across this whole unit. Look at it now and keep coming back to it.

Tap to zoom

Let’s practise telling ability from permission.

Modals of OBLIGATION and ADVICE — must, should, ought to, have to

Obligation means you have to do something — there is pressure or a rule. Advice means it is a good idea — but the choice is still yours. The difference between these is all about strength.

• must = strongest. A rule or a firm need. “You must wear a helmet.” (the law)
• have to = also strong obligation, often from an outside rule. “I have to reach by 9.” (Note: have to is not a true modal — it changes form: has to, had to — but it carries the same obligation meaning, so it sits with this group.)
• should = advice. The right thing, but not forced. “You should eat vegetables.”
• ought to = same as should — advice, slightly more formal. “You ought to apologise.” (This one does keep its “to”.)

These modals form a ladder from strong to soft. Figure 7.3 shows that ladder — and the same ladder also works for certainty, which we meet next.

Tap to zoom

Let’s pick the right strength for a real situation.

Modals of POSSIBILITY and CERTAINTY — may, might, could, must

Now the modals turn into guessing tools. Possibility means maybe true — you are not sure. Certainty means almost surely true — you are very sure, but still guessing, not stating a fact.

• may / might / could = possibility. “It may rain.” / “She might be at home.” / “He could be late.” All mean maybe (might is the least sure of the three).
• must = certainty (a strong guess). “The lights are off — they must be asleep.” You don’t know, but you’re almost sure.

Notice that must lives in two groups: obligation (you have to) AND certainty (almost-sure guess). And may lives in permission AND possibility. One modal, more than one meaning — so how do you tell them apart? You read the sentence around it.

Figure 7.4 below shows exactly how context splits “may” into two meanings — and gives you a quick test that also works for “must”.

Tap to zoom

This is the heart of modals, so let’s say it plainly. The same word can carry different attitudes. The grammar is fixed, but the meaning is flexible — and the flexibility is a feature, not a bug. It lets eleven small words cover a huge range of human meaning. Your job as a reader is to ask: what is the sentence really doing here — allowing, guessing, ordering, advising?

Polite REQUESTS — could, would, may

When you ask someone for something, the modal you pick decides how polite you sound. And there’s a neat pattern: the past-tense form of a modal sounds gentler than its present form.

• can → could: “Can you help?” (direct) becomes “Could you help?” (polite).
• will → would: “Will you wait?” (direct) becomes “Would you wait?” (polite).
• may: the most formal of all. “May I come in, sir?”

But why does the past form sound politer? This feels strange — you’re not talking about the past at all. Here’s the reason: the past tense puts a small distance between you and the request. “Can you?” sounds like you’re reaching out and grabbing the favour right now. “Could you?” steps back and gently checks whether the favour is even possible — it leaves the other person more room to say no. That tiny gap of distance is the politeness. It’s the same reason “I was wondering if you could…” sounds softer still — it pushes the ask even further away.

Figure 7.5 lays out this politeness ladder.

Tap to zoom

Let’s choose the right level of politeness.

Common Mistakes

The teaser before each box: these are the exact slips that cost easy marks in the grammar section. Read each one and check you don’t do it.

The first mistake is the most common of all — treating a modal like an ordinary verb and adding “-s”.

The second mistake squeezes a “to” in where it doesn’t belong.

The third mistake mixes up two meanings of the same modal.

Quick Check

Time to test the meaning and the grammar together. Pick the best answer in each.

Practice Problems

Try each one yourself first, then reveal the model answer.

Easy

Medium

Challenge

Summary

You should now be able to explain each of these in your own words:

• A modal is a helper verb (can, could, may, might, will, would, shall, should, must, ought to, need, dare) placed before the main verb to add an attitude — ability, permission, possibility, obligation, advice, request or certainty.
• The one fixed rule: modal + base verb (V1) — no “to”, no “-s”, and the same form for every subject (I/he/they all say “can go”). The modal does the grammar, so the main verb stays plain (Figure 7.1).
• “Ought to” is the odd one that keeps its “to”; “have to” carries obligation but changes form (has to / had to).
• Ability/permission: can, could (could = past ability or polite permission); may = formal permission.
• Obligation/advice: must (strongest, a rule), have to, should and ought to (advice). Pick the strength that matches the situation (Figure 7.3).
• Possibility/certainty: may/might/could = maybe; must = almost-sure guess.
• One modal can carry several meanings — “may” = permission OR possibility, “must” = obligation OR certainty. The sentence around it decides (Figure 7.4). Quick test: is a person giving permission?
• For polite requests, use the softer past-tense form — can → could, will → would; “may” is the most formal. The past tense adds distance, and distance is politeness (Figure 7.5).

What’s Next

In Unit 8: Reported Speech — Statements, you’ll learn how to report what someone said without quoting their exact words — turning He said, “I am tired” into He said that he was tired. Modals come back here too, because reporting often shifts them into their past forms (can → could, will → would, may → might) — the very past-tense forms you just met on the politeness ladder. So the work you did in this unit gives you a head start on the next one.