As it differs from the contract, please correct it (Stating a formal reason — since)

This grammar particle attaches to verbs or adjectives to state a logical, objective reason for the following clause. It's primarily used in formal, written, or official contexts.

Meaning & Usage

Meaning: It translates to "because," "since," or "therefore." It indicates that the first clause is a direct and logical cause for the second clause.

When to use: Use it in formal writing (reports, official notices), presentations, or serious, formal conversations like making a complaint or a legal argument. It sounds very stiff and unnatural in casual, everyday speech.

Conjugation Rules

Rule: The choice between ~므로 and ~으므로 depends on whether the verb/adjective stem ends in a vowel/ㄹ or a consonant.

Vowel or ㄹ ending stem: Attach ~므로. (e.g., 하다 → 하므로, 다르다 → 다르므로, 만들다 → 만들므로)

Consonant ending stem: Attach ~으므로. (e.g., 없다 → 없으므로, 같다 → 같으므로, 좋다 → 좋으므로)

Vowel/ㄹ: ~므로 / Consonant: ~으므로

While ~으므로/므로 means "because," it is not an all-purpose connector and using it incorrectly can make you sound like a textbook.

Avoid in Casual Conversation

Context: Never use ~으므로/므로 when telling a friend why you were late or why you like a certain food. It's too formal and lacks the emotional connection expected in casual speech. Use ~아/어서 or ~(으)니까 instead.

Example: (X) 배가 고프므로 밥을 먹자. → (O) 배고프니까 밥 먹자. (I'm hungry, so let's eat.)

Use for Objective, Factual Reasons

Context: This grammar shines when the reason is an undeniable fact, a rule, or a piece of evidence, like in the dialogues. It strengthens your argument by making it sound objective rather than like a personal feeling or excuse. It's perfect for complaints, official requests, and legal statements.

Do: 계약서에 명시되었으므로... (O) / Don't: 기분이 안 좋으므로 집에 갈래. (X)

Because ~으므로/므로 is used to state a formal, logical reason, it is often followed by a clause that makes a formal request, states a required action, or declares an official outcome.

Making a Request

When you present evidence (like a contract or a damaged product), you can use ~으므로/므로 to logically lead into your request for a specific action.

Common endings include ~아/어 주십시오 (please do), ~아/어 주셔야 합니다 (you must do), and ~을/를 요청합니다 (I request).

Stating a Consequence

This combination is also used by the person in authority (like the customer service agent) to state the action they will take based on the clear reason provided.

Common endings include ~해 드리겠습니다 (I will do it for you) or ~을/를 금합니다 (is prohibited).

계약서상 시급은 만 원으로 명시되어 있으므로 급여를 다시 계산해 주셔야 합니다. / 사유가 명확하므로 바로 환불 처리해 드리겠습니다.

When making a complaint, a company might offer a simple solution like a discount coupon that doesn't solve your actual problem. Here's how to politely reject it and state what you want.

Refuse and Explain

Start with a clear but polite refusal (아니요).

Briefly explain why their offer isn't suitable for your situation. In the dialogue, Sujin explains the cake was for a special occasion, making a future discount irrelevant.

State Your Desired Outcome

Use a phrase like 쿠폰은 의미가 없어요 (A coupon is meaningless) to firmly state that the offer is not a solution.

Clearly and formally state the action you require, such as 전액 환불을 요청합니다 (I request a full refund). This shifts the focus from their offer to your required resolution.

아니요. 쿠폰은 의미가 없어요. / 전액 환불을 요청합니다.

Choosing the right "because" is crucial for sounding natural and appropriate in Korean.

~으므로/므로 (Formal, Written)

Context: This is the most formal way to state a reason. It's best for official documents, public announcements, or when making a logical, evidence-based argument. Using it in a casual chat with a friend would sound very strange and overly dramatic.

Example: 본 회의는 비공개이므로 관계자 외 출입을 금합니다. (As this meeting is private, unauthorized personnel are prohibited from entering.)

~(으)니까 (Spoken, Subjective)

Context: This is common in spoken Korean. It often carries a nuance of the speaker's personal judgment or discovery. It's frequently used when giving a command or making a suggestion in the second clause. It can sometimes sound a bit demanding if not used carefully.

Example: 밖은 추우니까 따뜻하게 입어. (It's cold outside, so dress warmly.)

Formal/Written: ~으므로 / Spoken/Neutral: ~아/어서 / Spoken/Subjective: ~(으)니까