10.2 Fill-in-the-Blank Grammar, Connectors, and Auxiliary Verbs
Key Takeaways
- Official Reading criteria test vocabulary and grammar in context rather than reserving a fixed numbered block for fill-in-the-blank items.
- Mastering the functional division among causal connectors is essential: -아서/어서 cannot be combined with imperative (-(으)십시오) or suggestive (-(으)ㅂ시다) clause endings, whereas -(으)니까 is grammatically required.
- Conditional and purpose connectors (-(으)면, -(으)려면, -(으)려고) test workplace operational prerequisites, such as procedures required before operating heavy machinery.
- Auxiliary verb constructions define workplace permissions (-아/어도 되다), strict safety prohibitions (-(으)면 안 되다), legal duties (-아/어야 하다), and vocational experience (-(으)ㄴ 적이 있다/없다).
- Particle selection questions require absolute precision distinguishing topic markers (은/는), nominative markers (이/가), spatial destinations (에 vs. 에서), and instrumental means ((으)로).
Last updated: September 2026
10.2 Fill-in-the-Blank Grammar, Connectors, and Auxiliary Verbs
Exam Skill: The official Reading blueprint includes vocabulary and grammar in context. Fill-in-the-blank sentences or dialogues may test endings, connectors (연결어미), auxiliary constructions (보조용언), and particles (조사), but they are not assigned a permanent item-number range. Use both grammatical form and communicative meaning to choose the best completion.
1. Clausal Connectors of Cause and Reason (원인과 이유의 연결어미)
A useful grammatical distinction for EPS-TOPIK reading is the functional division between -아서/어서, -(으)니까, and -기 때문에.
The Causal Connector Comparison Matrix
| Connector | Core Meaning | Imperative (-(으)십시오) / Propositive (-(으)ㅂ시다) Allowed? | Past Tense (-았/었-) Allowed in First Clause? | Typical Workplace Usage Context |
|---|---|---|---|---|
| -아서/어서 | Because, since (natural cause, sequential result) | STRICTLY PROHIBITED (X) | STRICTLY PROHIBITED (X) | Stating personal physical states, emotional reactions, or common-sense results.<br>예: 머리가 아파서 병원에 갔습니다. |
| -(으)니까 | Because, since (speaker's discovery, condition for request/command) | MANDATORY / PERMITTED (O) | PERMITTED (O) | Issuing factory safety directives, making polite suggestions, or commands.<br>예: 위험하니까 안전모를 쓰십시오. |
| -기 때문에 | Because of, due to (formal, objective cause) | GENERALLY PROHIBITED (X) | PERMITTED (O) | Explaining objective factory rules, schedule delays, or weather impediments.<br>예: 폭우 때문에 작업을 중단했습니다. |
The Golden Imperative Rule (명령문·청유문 제약)
This rule alone resolves dozens of exam items:
- Incorrect: 공사장이 위험해서 안전모를 쓰십시오. (❌ -아서/어서 cannot take an imperative command ending).
- Correct: 공사장이 위험하니까 안전모를 쓰십시오. (⭕ -(으)니까 is grammatically required before -(으)십시오 or -(으)세요).
- Incorrect: 날씨가 좋아서 같이 축구합시다. (❌ -아서/어서 cannot take a propositive suggestion ending).
- Correct: 날씨가 좋으니까 같이 축구합시다. (⭕ -(으)니까 is required before -(으)ㅂ시다 or -(으)ㄹ까요?).
2. Condition, Purpose, Sequence, and Contrast Connectors
Beyond causal connectors, exam items frequently feature clause linkages denoting prerequisites, intentions, chronological sequences, and contrastive backgrounds.
Core Connectors in Workplace Reading
[Condition: -(으)면] ───────> "If / When A happens, B follows" (기계가 고장 나면 반장님께 알리세요)
[Purpose: -(으)려면] ───────> "If you intend to / want to do A, you must B" (자격증을 따려면 공부해야 해요)
[Intention: -(으)려고] ─────> "In order to do A, I did B" (한국에서 일하려고 시험을 봤습니다)
[Sequence: -(으)ㄴ 후에] ───> "After completing A, do B" (기계를 끈 후에 청소하십시오)
[Contrast: -지만] ──────────> "A is true, BUT B is also true" (일은 힘들지만 보람이 있습니다)
[Background: -는데/-(으)ㄴ데] ─> "Setting background / contrasting nuance" (퇴근하고 싶은데 잔업이 있어요)
Comparative Analysis of Connectors
| Connector Form | Semantic Function | Structural Constraint | Authentic Workplace Example Sentence |
|---|---|---|---|
| -(으)면 | Conditional / Temporal (If / When) | Vowel/ㄹ: -면, Consonant: -으면 | 기계에 이상이 있으면 즉시 작동을 멈추십시오. (If there is an abnormality in the machine, halt operation immediately.) |
| -(으)려면 | Conditional Intention (If one wants/intends to) | Contraction of -(으)려고 하면; main clause usually has -아/어야 하다 | 용접 작업을 배우려면 먼저 직업훈련원에 등록해야 합니다. (If you intend to learn welding, you must first register at the vocational institute.) |
| -(으)려고 | Purpose / Intention (In order to / Intending to) | Main clause contains action taken to achieve purpose; cannot take imperative | 고향에 돈을 보내려고 은행에 가는 중입니다. (I am on my way to the bank in order to send money home.) |
| -기 전에 | Chronological Precedence (Before doing) | Attached to bare verb stem | 기계를 조작하기 전에 반드시 안전 점검을 하십시오. (Before operating the machine, be sure to perform a safety inspection.) |
| -(으)ㄴ 후에 / 뒤에 | Chronological Completion (After doing) | Past modifier attached to completed action | 페인트 작업을 끝낸 후에 환기 팬을 켜 두세요. (After finishing the painting work, leave the ventilation fan turned on.) |
| -지만 | Direct Adversative Contrast (Although / But) | Simple clash of facts or evaluations | 월급은 많지만 야간 근무가 많아서 피곤합니다. (The salary is high, but I am fatigued because there is frequent night duty.) |
| -는데 / -(으)ㄴ데 | Background / Soft Contrast (While / But / And) | Verb: -는데, Adjective: -(으)ㄴ데, Noun: -인데 | 지금 회의 중인데 잠시 후에 다시 전화해 주시겠어요? (We are currently in a meeting, so could you call back in a moment?) |
3. Auxiliary Verb Formations & Modal Expressions (보조용언과 양태 표현)
In industrial environments governed by the Ministry of Employment and Labor (고용노동부) and KOSHA safety guidelines, workplace regulations are framed using auxiliary verbs denoting obligation, prohibition, permission, and acquired skill.
Industrial Modal Paradigms
| Grammatical Construction | Modal Function | English Equivalent | Factory Safety / Workplace Law Context |
|---|---|---|---|
| -아/어도 되다 | Permission | You may / It is acceptable to... | 작업이 끝난 후에는 휴게실에서 쉬어도 됩니다. (You may rest in the breakroom after work is finished.) |
| -(으)면 안 되다 | Strict Prohibition | You must not / It is forbidden to... | 작업장 안에서는 절대로 담배를 피우면 안 됩니다. (You must under no circumstances smoke inside the workshop.) |
| -아/어야 하다 / 되다 | Mandatory Duty / Obligation | Must / Have to / Required to... | 프레스 작업 시 반드시 보호구를 착용해야 합니다. (When performing press work, you must wear protective gear.) |
| -(으)ㄹ 수 있다 / 없다 | Capability / Possibility | Can / Cannot / Is able to... | 지게차 면허가 없으면 운전을 할 수 없습니다. (If you do not hold a forklift license, you cannot drive it.) |
| -(으)ㄴ 적이 있다 / 없다 | Past Experience / Qualification | Have / Have not done before... | 한국 공장에서 용접을 해 본 적이 있습니까? (Have you ever had experience welding in a Korean factory?) |
| -기로 하다 | Mutual Decision / Resolution | Decided to / Agreed to... | 다음 주말에 동료들과 낚시를 가기로 했습니다. (I decided to go fishing with my colleagues next weekend.) |
| -(으)려고 하다 | Planned Intent | Plan to / Intend to... | 이번 달 월급을 받으면 부모님께 송금하려고 합니다. (When I receive this month's pay, I intend to remit money to my parents.) |
[Workplace Modality Spectrum]
Prohibition (-(으)면 안 되다) <───> Permission (-아/어도 되다)
Obligation (-아/어야 하다) <───> Capability (-(으)ㄹ 수 있다)
4. Grammatical Particles in Sentence Blanks (조사의 용법)
When a blank occurs immediately following a noun, the question is testing particle precision. A single particle change transforms the agent, destination, instrument, or topic of the sentence.
Essential Particle Diagnostic Matrix
| Particle | Grammatical Role | Key Workplace Distinction | Example Sentence |
|---|---|---|---|
| 은 / 는 | Topic / Contrast / General Fact | Marks known topic or emphasizes contrast between two items | 반장님은 사무실에 계시고, 투안 씨는 현장에 있습니다. (The foreman is in the office, whereas Tuan is at the worksite.) |
| 이 / 가 | Subject / Specific Agent | Marks the specific grammatical subject of an intransitive verb or state | 프레스 기계가 고장 났습니다. (The press machine has broken down.) |
| 을 / 를 | Direct Object | Marks the recipient of a transitive action | 자재를 트럭에 실으십시오. (Load the materials onto the truck.) |
| 에 | Destination / Static Location / Time | Indicates direction, destination with 가다/오다, or time point | 9시에 작업장에 도착했습니다. (I arrived at the workshop at 9 o'clock.) |
| 에서 | Dynamic Action Location / Origin | Marks where an ongoing physical action takes place, or origin point | 창고에서 상자를 포장하고 있습니다. (I am packing boxes in the warehouse.) |
| (으)로 | Direction / Tool / Instrument / Means | Vowel/ㄹ: 로, Consonant: 으로; indicates method, tool, or heading | 지게차로 무거운 파이프를 옮기세요. (Move the heavy pipes using a forklift.) |
| 에게 / 한테 | Dative (Person recipient) | 에게 is formal written, 한테 is colloquial spoken | 안전 관리자에게 작업 일지를 제출했습니다. (I submitted the work log to the safety supervisor.) |
Common Particle Pitfall: '에' vs '에서'
- If the verb is 있다/없다/살다/도착하다, the location takes 에 (기숙사에 살아요 / 공장에 있어요).
- If the verb involves dynamic labor or movement like 일하다/청소하다/용접하다/먹다, the location requires 에서 (공장에서 일해요 / 식당에서 밥을 먹어요).
Test Your Knowledge
다음 빈칸에 들어갈 가장 알맞은 것을 고르십시오. 작업장 바닥에 기름이 묻어 있어서 미끄러우( ) 조심해서 걸으십시오.
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Test Your Knowledge
다음 빈칸에 들어갈 가장 알맞은 것을 고르십시오. 공장 안에서는 안전사고의 위험이 있으므로 절대 담배를 피우( ).
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Test Your Knowledge
다음 빈칸에 들어갈 가장 알맞은 것을 고르십시오. 무거운 쇠파이프를 손으로 들지 말고 지게차( ) 운반하십시오.
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