Grammar guide example

Core procedure

For each difficult line:

1. Find the main predicate and the head noun of every long modifier.
2. Recover omitted subjects from speaker, topic, agency, and viewpoint.
3. Mark negation scope, conditions, contrast, and evidence level.
4. Decide which idea deserves to be the English main clause.
5. Restructure freely while preserving voice, ambiguity, and reveal timing.
6. Check approved names and terms.
7. Confirm that tags and placeholders remain balanced.
8. Record the probable bad output and a corrected good output to show the failure.

1. Long prenominal modifiers

Japanese can place an entire proposition before the noun it modifies. English usually needs a relative clause, apposition, finite verb, or new sentence.

Example 1 — name the device first

• Line: DEMO:0001
• Source: 霧が濃くなると青く点滅して危険を知らせる古い携帯端末
• Head noun: 古い携帯端末
• Bad English: “The old portable terminal that flashes blue and informs of danger when the fog becomes thick…”
• Good English: “The old handheld flashed blue whenever the fog thickened, warning its owner of danger.”

The Japanese explains the full behavior before naming the object. English is clearer when the device becomes the subject immediately.

Example 2 — unpack a biography

• Line: DEMO:0002
• Source shape: 幼い頃に島を離れ、十年ぶりに灯台へ戻ってきた少女
• Bad English: “The girl who left the island when she was young and returned to the lighthouse for the first time in ten years.”
• Good English: “She had left the island as a child. Now, ten years later, she had returned to the lighthouse.”

Do not force two life stages into “the girl who left…and returned….” Separate sentences can preserve the change in time.

2. Omitted subjects and viewpoint

Japanese may omit a subject for several consecutive lines. The missing actor is not automatically the most recently named person.

Example 3 — keep one subject through a verb chain

• Line: DEMO:0003
• Context: first-person narration
• Source: 鍵を返し、廊下に出たところで、ようやく異変に気づいた。
• Bad English: “After the key was returned and the corridor was entered, the abnormality was finally noticed.”
• Good English: “I returned the key and stepped into the hall. Only then did I notice something was wrong.”

All three actions belong to the narrator. A model may incorrectly assign the final perception to another active character.

Example 4 — conditional subject

• Line: DEMO:0004
• Source: 本当のことを話せば、先生は止めるだろう。
• Bad English: “If the truth were told, the teacher would stop.”
• Good English: “If I told the doctor the truth, she would try to stop me.”

The subject of 話せば comes from viewpoint context. 先生 is the subject of 止める, and its role translation must come from the terminology authority.

3. Partial negation and the わけ family

Example 5 — すべて…わけではない

• Line: DEMO:0005
• Source: 記録のすべてが失われたわけではない。
• Bad English: “None of the records survived.”
• Good English: “Not all of the records were lost.”

The source denies total loss. It does not state that everything disappeared.

Example 6 — ないわけではない

• Line: DEMO:0006
• Source: 方法がないわけではないが、今夜は使えない。
• Bad English: “It is not the case that there is no method, but tonight cannot use it.”
• Good English: “It wasn't that we had no way to do it; we just couldn't use it tonight.”

The double negative concedes that a method exists before introducing the real limitation.

4. という, こと, and delayed definitions

These forms quote, label, nominalize, explain, or infer. Repeated use of “the fact that” usually produces unnatural English.

Example 7 — inferred consequence

• Line: DEMO:0007
• Source: ここに足跡があるということは、誰かが先に入ったということになる。
• Bad English: “The fact that footprints are here becomes the fact that someone entered first.”
• Good English: “These footprints meant someone had entered before us.”

Translate the conclusion directly. The paired nominalizers express reasoning, not two literal “facts.”

Example 8 — というより

• Line: DEMO:0008
• Source: 静かというより、音が吸い込まれているようだった。
• Bad English: “Rather than quiet, it seemed that the sound was being inhaled.”
• Good English: “It wasn't so much quiet as though the room were swallowing every sound.”

This corrects the first category with a more precise one.

5. Concession and hypothetical distance

Example 9 — disappointed ものの

• Line: DEMO:0009
• Source: ようやく扉を開けたものの、その先には壁しかなかった。
• Bad English: “She finally opened the door, although only a wall was beyond it.”
• Good English: “At last she forced the door open, only to find a wall behind it.”

“Only to find” preserves the frustrated expectation more naturally than a mechanical “although.”

Example 10 — futile たところで

• Line: DEMO:0010
• Source: 今から港へ走ったところで、最終便には間に合わない。
• Bad English: “Even when we run to the harbor now, we cannot be in time for the last ferry.”
• Good English: “Even if we ran to the harbor now, we'd never make the last ferry.”

The conditional states that the action cannot succeed. It does not describe a neutral future sequence.

Example 11 — reluctant concession

• Line: DEMO:0011
• Source: 百歩譲って彼の話を信じるとしても、時計の説明がつかない。
• Bad English: “Even if I yielded one hundred steps and believed his story, the clock could not be explained.”
• Good English: “Even if I granted his story, it still wouldn't explain the clock.”

百歩譲って marks argumentative reluctance. Do not translate its literal image.

6. Passive, causative, and result chains

Example 12 — restore the true agent

• Line: DEMO:0012
• Source: 姉に説得されるかたちで調査に参加することになった。
• Bad English: “It became that I would participate in the investigation in the form of being persuaded by my older sister.”
• Good English: “My sister talked me into joining the investigation.”

The Japanese uses passive persuasion and a formal result construction. English can use the persuader as the subject of an active verb.

Example 13 — formal compulsion

• Line: DEMO:0013
• Source: 濃霧のため、船は引き返すことを余儀なくされた。
• Bad English: “Due to the dense fog, the ship was unavoidably made to return.”
• Good English: “The fog forced the boat to turn back.”

The bad version copies the Japanese compulsion construction without a natural English agent. In a formal report, “The vessel was forced to turn back because of heavy fog” is also good. Choose active or passive voice according to register.

7. Change, completion, regret, and loss of control

ことになる, ようになる, and てしまう do not all mean “ended up.”

Example 14 — change over time

• Line: DEMO:0014
• Source: その日から、彼女も無線に答えるようになった。
• Bad English: “From that day, she also came to become able to answer the radio.”
• Good English: “After that day, she began answering the radio.”

ようになる describes a change in behavior or capability.

Example 15 — involuntary emotional result

• Line: DEMO:0015
• Source: あの歌を聞くと、どうしても昔のことを思い出してしまう。
• Bad English: “When I hear that song, unfortunately I end up remembering old things.”
• Good English: “Whenever I heard that song, memories of the past came flooding back.”

The English verb expresses the lack of control. The addition of “unfortunately” overstates the source.

8. Evidentiality and narrator certainty

This distinction is necessary in mystery stories. Do not change inference or hearsay into fact.

Example 16 — appearance

• Line: DEMO:0016
• Source: 窓は内側から割られたらしい。
• Bad English: “The window was broken from the inside.”
• Good English: “The window appeared to have been broken from the inside.”

The narrator makes an inference from evidence.

Example 17 — hearsay

• Line: DEMO:0017
• Source: 昔、この島には観測所があったそうだ。
• Bad English: “There used to be an observatory on the island.”
• Good English: “They say there used to be an observatory on the island.”

Plain-form そうだ reports hearsay. It is not proof that the observatory existed.

9. Clefts, delayed focus, and list rhythm

Example 18 — delayed subject

• Line: DEMO:0018
• Source shape: 霧笛が一度だけ鳴る夜に姿を現すのが、あの白い船だ。
• Bad English: “What appears on nights when the foghorn sounds only once is that white ship.”
• Good English: “The white ship appeared only on nights when the foghorn sounded once.”

When a direct subject is clearer, English does not need the delayed のが…だ cleft.

Example 19 — intentional catalogue fragments

• Line: DEMO:0019
• Source: 錆びた鎖。濡れた切符。誰もいない待合室。
• Bad English: “There were a rusted chain, a wet ticket, and a waiting room where no one was.”
• Good English: “A rusted chain. A waterlogged ticket. An empty waiting room.”

The fragments create a visual sequence. A complete sentence removes the separate rhythmic units.

List markers such as や, たり, とか, and など often introduce an incomplete list. Treat examples as a complete inventory only when context supports that meaning.

10. Register, roles, and social address

Japanese role terms do not have one global English equivalent.

Use contractions, sentence length, hedging, titles, and vocabulary to convey register. Use phonetic eye dialect only under a deliberate, reviewed project policy.

Example 20 — translate the role, not the dictionary label

• Line: DEMO:0020
• Context: a patient speaking politely to a physician
• Source: 先生、もう一度診てください。
• Bad English: “Teacher, please look at me one more time.”
• Good English: “Doctor, could you examine me again?”

The bad version selects the most familiar dictionary meaning of 先生. It treats 診る as ordinary looking. The context determines the role noun and the medical meaning of the verb. Keep the request polite and natural.

11. Reveal-sensitive ambiguity

Example 21 — conditional identity

• Line: DEMO:0021
• Source: もし岬で見た人物が彼女だったのなら、日記の時刻と矛盾する。
• Bad English: “I saw her at the cape, which contradicted the diary.”
• Good English: “If the person I saw at the cape was her, the time in the diary couldn't be right.”

The source proposes an identity conditionally. Later knowledge must not turn the earlier line into a fact.

Example 22 — vague referent

• Line: DEMO:0022
• Source: あの人も、同じことを知っていたのだろうか。
• Bad English: “Did she also know the same thing?”
• Good English: “Had that person known the same thing?”

If the viewpoint deliberately avoids a name or gender, do not reveal either in English. Unnatural wording can be preferable to a spoiler.

12. Markup inside grammar

Treat tags as protected structure, not punctuation.

Example 23 — paired tag

• Line: DEMO:0023
• Source: <term=004>白い船</term>を見たのは、あの夜が初めてだった。
• Bad English: “That night was the first time I saw the White Ship.”
• Good English: “That night was the first time I saw the <term=004>White Ship</term>.”

Translate visible text inside the tag. Preserve the tag name, ID, and pair. With placeholders before generation, the protected form can be That night was the first time I saw [[TAG_0001]]White Ship[[TAG_0002]].

Do not move only one half of a pair across a line, page, or textbox split.

13. Line splitting and joining

Split when:

• a long modifier becomes clearer as a new sentence
• Japanese chains several independent claims
• a punch line or reveal deserves its own beat
• the English line would exceed comfortable textbox width.

Do not split when:

• a voice clip or presentation tag requires continuity
• suspense depends on a withheld subject
• page-control behavior would display the pieces incorrectly
• a paired tag or variable would become unbalanced.

Join Japanese fragments only when they support the grammar and sound accidental as separate English fragments. Preserve deliberate catalogue fragments, interruptions, and emotional beats.

Example 24 — split a clause chain into readable beats

• Line: DEMO:0024
• Source: 端末は沈黙したまま、彼女が何度呼びかけても返事はなく、やがて画面の光まで消えた。
• Bad English: “The terminal remaining silent, even though she called out many times there was no reply, and before long even the screen's light disappeared.”
• Good English: “The terminal stayed silent. No matter how many times she called, no one answered. Eventually, even the screen went dark.”

The bad version copies each Japanese connective without a stable English main clause. The good version uses three finite sentences for three narrative developments. It preserves their order and increasing intensity.

Batch checklist

Before translation:

• identify narrator, speaker, time period, and active scene
• load relevant terminology and identity rules
• inspect neighboring rows
• note aliases or facts the viewpoint does not yet know.

For each difficult line:

• bracket long modifiers and name their head nouns
• label omitted subjects in scratch work
• mark negative scope
• mark evidence level
• choose the English main clause
• check pronouns against every active character
• preserve tags, IDs, and variables.

After translation:

• search for approved and deprecated terms
• check partial negatives and competing alternatives
• check that hypotheses did not become facts
• check that production labels do not appear in displayed names
• read English alone for clarity
• compare against Japanese again for lost qualifications.

Quick reference