Episode 22 — 조동사: can · will · must · should가 만드는 뉘앙스

MisoEnglish Grammar Series

Episode 22 — 조동사

can · will · must · should가 만드는 뉘앙스

"문법을 외우지 말고, 느껴라" Don't memorize grammar. Feel it.

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🧭 들어가며 | Introduction

조동사는 단순히 "할 수 있다", "해야 한다"를 표현하는 게 아니다.

Modal verbs aren't just about "can do" or "must do."

조동사는 화자의 태도, 확신의 정도, 가능성, 의무감을 동사에 실어 전달하는 도구다.

Modal verbs carry the speaker's attitude, degree of certainty, possibility, and sense of obligation — all loaded into one word.

같은 상황에서 can / could / may / might / must / should / will / would를 어떻게 쓰느냐에 따라 의미가 완전히 달라진다. 이 차이를 느끼는 것이 이번 편의 핵심이다.

In the same situation, choosing between can / could / may / might / must / should / will / would changes everything. Feeling that difference is the core of this episode.

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1. 조동사의 공통 규칙 | Common Rules for All Modals

모든 조동사는 같은 규칙을 따른다.

All modal verbs follow the same rules.

① 조동사 + 동사원형 — -s, -ed, -ing 없음

She can swim. ✅ / ~~She can swims.~~ ❌
He should go. ✅ / ~~He should goes.~~ ❌

② 부정: 조동사 + not

I cannot (can't) do it.
She should not (shouldn't) go.

③ 의문문: 조동사를 앞으로

Can you help me?
Should I stay?

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2. can / could — 능력, 가능성, 허가 | Ability, Possibility, Permission

can — 현재의 능력·가능성·허가

She can speak three languages.
그녀는 세 가지 언어를 할 수 있다. (능력)
It can get very cold here.
여기는 매우 추워질 수 있다. (가능성)
Can I use your phone?
전화기 써도 될까요? (허가 요청)
You can go now.
이제 가도 됩니다. (허가)

could — 과거 능력 / 정중한 요청 / 약한 가능성

She could swim when she was five.
그녀는 다섯 살 때 수영할 수 있었다. (과거 능력)
Could you help me?
도와주실 수 있을까요? (can보다 정중한 요청)
It could rain later.
나중에 비가 올 수도 있다. (약한 가능성)

can vs could 뉘앙스 비교

Can you open the window?
창문 열어줄래? (친근, 직접적)
Could you open the window?
창문 열어주실 수 있을까요? (정중, 공손)

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3. may / might — 가능성, 허가 | Possibility, Permission

may — 공식적 허가 / 50% 정도의 가능성

May I come in?
들어가도 될까요? (격식 있는 허가 요청)
You may leave now.
이제 가셔도 됩니다. (격식 있는 허가)
It may rain tomorrow.
내일 비가 올 수도 있다. (50% 가능성)

might — may보다 낮은 가능성 (30~40%)

It might rain tomorrow.
내일 비가 올지도 모른다. (더 낮은 가능성)
She might be at home.
그녀가 집에 있을지도 몰라. (확신 없음)

가능성의 스펙트럼 | Possibility Spectrum

높음 High                                    낮음 Low
will → must → should → may → might → could
100%   95%     80%      50%    30%      20%

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4. must / have to — 의무, 강한 추론 | Obligation, Strong Deduction

must — 강한 의무 (내적 동기) / 강한 추론

의무:

You must wear a seatbelt.
안전벨트를 매야 한다. (규칙·필요)
I must finish this today.
오늘 이것을 끝내야 한다. (내 스스로 느끼는 의무)

강한 추론 (틀림없이 ~일 것이다):

She must be tired.
그녀는 틀림없이 피곤할 것이다.
He must know the answer.
그는 분명히 답을 알 것이다.

have to — 외부적 의무

I have to submit the report by Friday.
금요일까지 보고서를 제출해야 한다. (외부 규칙)
You have to be 18 to vote.
투표하려면 18세여야 한다. (법적 요건)

must vs have to 차이

I must study. ← 내가 스스로 필요하다고 느낌 (내적)
I have to study. ← 누군가 시켰거나 외부 상황 때문 (외적)

must not vs don't have to 차이 ⚠️

You must not smoke here. 여기서 담배를 피우면 안 된다. (금지)
You don't have to come. 올 필요가 없다. (의무 없음, 선택)

이 두 가지를 혼동하면 완전히 다른 의미가 된다!

Confusing these two creates a completely different meaning!

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5. should / ought to — 충고, 기대 | Advice, Expectation

should — 충고, 권고, 기대

You should see a doctor.
의사를 만나보는 게 좋겠어. (충고)
She should be here by now.
그녀는 지금쯤 여기 있어야 하는데. (기대)
You shouldn't eat so much sugar.
설탕을 그렇게 많이 먹으면 안 돼. (권고)

ought to — should와 비슷하지만 더 격식적

You ought to apologize.
사과해야 마땅하다. (도덕적 의무 강조)
He ought to know better.
그는 더 잘 알아야 한다.

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6. will / would — 의지, 습관, 정중한 요청 | Will, Habit, Polite Requests

will — 의지, 즉흥적 결정, 예측 (Episode 10 복습)

I will help you. 내가 도와줄게. (의지)
Will you marry me? 나와 결혼해줄래? (요청)

would — will의 과거 / 정중한 요청 / 가정

She said she would come.
그녀는 오겠다고 했다. (과거의 will)
Would you like some coffee?
커피 드실래요? (정중한 제안)
Would you mind closing the door?
문 좀 닫아주시겠어요? (정중한 요청)
I would love to go.
가고 싶어요. (would like = want의 정중한 표현)

would vs could 정중함 비교

Can you help me? (직접적)
Could you help me? (정중)
Would you help me? (더 정중)
Would you mind helping me? (가장 정중)

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7. 조동사 + have + p.p. — 과거에 대한 추론 | Modals + have + p.p.

조동사는 과거의 일에 대한 추론이나 후회를 표현할 때도 쓰인다.

Modals can also express deduction or regret about past events.

조동사 + have + p.p.
modal + have + past participle

표현 의미 예문

must have + p.p.	~했음이 틀림없다	She must have forgotten.
can't have + p.p.	~했을 리 없다	He can't have done that.
should have + p.p.	~했어야 했는데 (후회)	I should have studied more.
could have + p.p.	~할 수 있었는데 (못함)	She could have won.
might have + p.p.	~했을지도 모른다	He might have left early.
would have + p.p.	~했을 것이다 (가정)	I would have helped you.

I should have called her.
그녀에게 전화했어야 했는데. (후회)
She must have been exhausted.
그녀는 틀림없이 지쳐있었을 것이다.
He can't have known about it.
그가 그것에 대해 알았을 리 없다.

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8. 조동사 총정리 | Complete Modal Map

조동사 주요 쓰임 예문

can	능력, 가능성, 허가	Can you swim?
could	과거 능력, 정중한 요청, 약한 가능성	Could you help me?
may	격식 허가, 50% 가능성	It may rain.
might	낮은 가능성 (30%)	It might rain.
must	강한 의무, 강한 추론	You must stop. / She must be tired.
have to	외부적 의무	I have to go.
should	충고, 기대	You should rest.
ought to	도덕적 의무	You ought to apologize.
will	의지, 즉흥 결정, 예측	I'll do it.
would	정중한 요청, 과거의 will	Would you like some?

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📌 이번 편 요약 | Episode Summary

1. 조동사 + 동사원형 — -s/-ed/-ing 없음, 부정은 not 바로 붙이기 Modal + base verb — no -s/-ed/-ing; negative = modal + not.
2. can/could — 능력·가능성·허가 / could는 과거 또는 정중함 can/could — ability, possibility, permission / could = past or polite.
3. may/might — 가능성의 정도 차이 (may 50% > might 30%) may/might — degree of possibility (may 50% > might 30%).
4. must/have to — 내적 의무 vs 외적 의무 / must not ≠ don't have to must/have to — internal vs external obligation / must not ≠ don't have to.
5. should — 충고와 기대 / ought to는 도덕적 의무 강조 should — advice and expectation / ought to emphasizes moral obligation.
6. modal + have + p.p. — 과거 사건에 대한 추론과 후회 Modal + have + p.p. — deduction and regret about past events.

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🔜 다음 편 예고 | Coming Up Next

Episode 23 — 수동태 : 당하는 입장에서 말할 때 Passive Voice: Speaking from the Receiving End

능동태와 수동태 — 같은 사건을 다른 시각으로 보는 것. "누가 했는가"보다 "무엇이 일어났는가"에 집중할 때, 영어는 수동태를 선택한다.

Active vs passive — the same event from a different perspective. When "what happened" matters more than "who did it," English chooses the passive.

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© MisoEnglish Grammar Series | Level 4 — Episode 22 "문법을 외우지 말고, 느껴라" | "Don't memorize grammar. Feel it."

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Modal Verbs: The Nuance Behind can, will, must, and should

How One Word Changes Everything About What You're Saying

MisoEnglish Grammar Series — Episode 22

"Don't memorize grammar. Feel it."

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Introduction

Modal verbs are small words that carry enormous weight. The difference between "you must leave" and "you should leave" and "you could leave" isn't just grammatical — it's the difference between a command, a suggestion, and an option.

Every modal carries a specific attitude: certainty, possibility, obligation, willingness, politeness. This episode maps out what each one does — and how choosing the right one shapes exactly what you're communicating.

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1. Rules All Modals Share

Modal + base verb — never add -s, -ed, or -ing:

She can swim. ✅ / ~~She can swims.~~ ❌

Negative: modal + not:

I can't do it. / She shouldn't go.

Question: modal moves to the front:

Can you help me? / Should I stay?

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2. can / could — Ability, Possibility, Permission

can — present ability, possibility, permission:

She can speak three languages. (ability)
It can get very cold here. (possibility)
Can I use your phone? (permission request)

could — past ability / polite request / weak possibility:

She could swim when she was five. (past ability)
Could you help me? (more polite than "can")
It could rain later. (weak possibility)

The politeness difference:

Can you open the window? → direct, casual
Could you open the window? → polite, softer

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3. may / might — Possibility and Permission

may — formal permission / ~50% possibility:

May I come in? (formal permission request)
It may rain tomorrow. (about 50% likely)

might — lower possibility (~30%):

It might rain tomorrow. (less certain than may)
She might be at home. (uncertain)

Possibility spectrum:

High                                    Low
will → must → should → may → might → could
100%   95%     80%      50%    30%      20%

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4. must / have to — Obligation and Deduction

must — internal obligation / strong deduction:

You must wear a seatbelt. (obligation — rule or necessity)
I must finish this today. (felt from within)
She must be tired. (strong deduction — I'm almost certain)

have to — external obligation:

I have to submit the report by Friday. (external deadline)
You have to be 18 to vote. (legal requirement)

The key difference:

I must study. → I feel this need myself. (internal)
I have to study. → Someone told me / external situation. (external)

Critical distinction — must not vs. don't have to:

You must not smoke here. → Prohibition.
You cannot do this. You don't have to come. → No obligation. It's your choice.

These are opposites. Mixing them up completely changes the meaning.

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5. should / ought to — Advice and Expectation

should — advice, recommendation, expectation:

You should see a doctor. (advice) She
should be here by now. (expectation — but she isn't)
You shouldn't eat so much sugar. (recommendation)

ought to — similar to should, more formal, moral emphasis:

You ought to apologize. (you have a moral duty to)
He ought to know better. (stronger expectation)

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6. will / would — Willingness, Habit, Polite Requests

will — willingness, spontaneous decision, prediction:

I will help you. (willingness)
Will you marry me? (request)

would — past will / polite request / hypothetical:

She said she would come. (past of will — reported speech)
Would you like some coffee? (polite offer)
Would you mind closing the door? (very polite request)

Politeness scale:

Can you help me? → direct
Could you help me? → polite
Would you help me? → more polite
Would you mind helping me? → most polite

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7. Modals + have + p.p. — Past Deduction and Regret

When you want to reason about past events — or express regret about them:

modal + have + past participle

Expression Meaning Example

must have + p.p.	certainly happened	She must have forgotten.
can't have + p.p.	certainly didn't happen	He can't have done that.
should have + p.p.	should have but didn't (regret)	I should have studied more.
could have + p.p.	was possible but didn't happen	She could have won.
might have + p.p.	possibly happened	He might have left early.

I should have called her. (I regret that I didn't.)
She must have been exhausted. (I'm certain she was.)
He can't have known about it. (It's impossible that he knew.)

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Episode Summary

1. Modal + base verb — no conjugation, negative = modal + not.
2. can/could — ability, possibility, permission / could = past or polite.
3. may/might — possibility: may (~50%) > might (~30%).
4. must/have to — internal vs external obligation.
5. must not ≠ don't have to — prohibition vs no obligation.
6. should — advice and expectation.
7. would — polite requests, past will, hypothetical.
8. Modal + have + p.p. — past deduction and regret.

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Coming Up Next

Episode 23 — Passive Voice: Speaking from the Receiving End

Active and passive are the same event from different angles. When "what happened" matters more than "who did it," English reaches for the passive. We map out when, why, and how.

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© MisoEnglish Grammar Series | Level 4 — Episode 22 "Don't memorize grammar. Feel it."

 

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