精密な文法運用Precise Grammar Control
Chapter Objectives
By the end of this chapter, you will be able to:
- Choose among と, ば, たら, and なら with precision, based on the exact relationship between condition and result.
- Distinguish fine shades of modality and stance, including はず, に違いない, かねない, and わけではない.
- Nominalize a clause with こと or の appropriately, choosing the form that fits the surrounding predicate and register.
- Embed a clause inside a noun phrase with the correct level of density for dense professional and academic prose.
- Distinguish related passive and causative-passive constructions and explain the shift in responsibility and perspective each one carries.
- Manage topic and focus deliberately across a paragraph, rather than sentence by sentence.
- Read a dense passage of professional or academic Japanese and identify which precision system each sentence relies on.
- Revise a piece of your own writing by replacing an approximate structure with the more precise structure the context actually requires.
Communication Scenario
エマ has begun drafting her first piece for 山本さん's magazine on regional and social language use, but her own diagnostic from Chapter 1 flagged exactly the systems this draft depends on most: the conditionals, and the fine modal distinctions that separate a cautious claim from an overstated one. When 山本さん reads her first draft, he does not tell her the Japanese is wrong — he tells her it is imprecise, and that at this level, imprecision changes what the sentence actually means. This chapter follows Emma as she revises that draft sentence by sentence, replacing approximate structures with exact ones, and asks the learner to do the same with a passage of their own.
- The learner listens to 山本さん explaining why one of Emma's sentences is imprecise rather than wrong.
- The learner reads Emma's revised paragraph alongside her first draft.
- The learner studies four precision systems: conditionals, modality/stance, nominalization and embedding, and passive/causative distinctions.
- The learner practices choosing the exact structure a context requires, rather than any structure that is merely acceptable.
- The learner revises a paragraph of their own writing using at least three of this chapter's precision systems.
- The learner explains, in Japanese, why one structure fits a given context better than a plausible alternative.
Core Vocabulary
This chapter's vocabulary names the precision systems themselves and supports talking about grammar with exactness — language you will reuse throughout the volume whenever you discuss your own writing. All twelve items below are productive for this chapter.
| Japanese | Reading | Meaning | Domain |
|---|---|---|---|
| 言い換える | いいかえる | to rephrase, to say in other words | Revision |
| 断定する | だんていする | to assert flatly, to state as certain | Modality |
| 含みを持たせる | ふくみをもたせる | to leave an implication, to hedge deliberately | Modality |
| 条件 | じょうけん | condition, precondition | Conditionals |
| 結果 | けっか | result, outcome | Conditionals |
| 節を埋め込む | せつをうめこむ | to embed a clause | Clause structure |
| 名詞化する | めいしかする | to nominalize, to turn into a noun phrase | Clause structure |
| 責任の所在 | せきにんのしょざい | where responsibility lies | Passive/causative |
| 視点 | してん | viewpoint, perspective | Discourse |
| 際立たせる | きわだたせる | to make (something) stand out, to foreground | Topic/focus |
| 曖昧さ | あいまいさ | ambiguity, vagueness | Precision |
| 言葉を選ぶ | ことばをえらぶ | to choose one's words (carefully) | Precision |
No unscheduled kanji are introduced with these items; each uses kanji already consolidated in Volume IV. These items are metalinguistic — they describe grammar rather than a new topic domain — and should recombine naturally with the vocabulary from Chapter 1's diagnostic.
れんしゅう — Practice: For each of the twelve items above, write one sentence about your own writing process (for example, この文には、少し曖昧さが残っていると思う。).
Script and Terminology Focus
This chapter introduces no new kanji. Its script focus is on okurigana and kanji precision in the advanced predicates this chapter activates, since a single mistaken okurigana ending can silently change a predicate's meaning at this level.
Several of this chapter's structures attach directly to a verb stem or add an auxiliary ending, and a small okurigana error can obscure which structure is intended. Compare 含みを持たせる (to leave an implication) with an incorrectly spelled variant that drops or misplaces okurigana — a reader can no longer tell whether the verb is transitive, causative, or something else entirely. When proofreading dense professional writing, check okurigana on every compound predicate you have modified, not only on words you consider new.
れんしゅう — Practice: Choose five compound predicates from this chapter's Grammar and Sentence Patterns section. Write each one twice — once with correct okurigana, and once with a plausible okurigana error a learner might make — and note what meaning or grammatical category the error would suggest.
Pronunciation Focus
When a spoken argument depends on a fine modal distinction — for instance, the difference between 〜はずだ and 〜に違いない — phrase-level pitch and pacing can either support or undercut that distinction. A flat, rushed delivery can make a careful hedge sound like a flat assertion, and the reverse. As you practice this chapter's spoken tasks, read each sentence aloud slowly enough that the modal ending receives its own clear phrase-final contour, while keeping mora timing, vowel length, and moraic ん steady throughout.
Grammar and Sentence Patterns
This chapter authorizes fine-grained distinctions in four interconnected systems: conditionals, modality and stance, nominalization and clause embedding, and passive/causative constructions. None of these systems is new — all were introduced or developed in earlier volumes. What is new is the expectation that you choose among near-synonymous options deliberately, based on exactly what the context requires.
1. Choosing among と, ば, たら, and なら with precision
Purpose: to select the conditional whose nuance — general truth, evaluative condition, sequential result, or premise-based judgment — actually matches the intended meaning.
| Form | Core Nuance | Typical Use in Dense Prose |
|---|---|---|
| 〜と | a general or mechanical result that follows automatically | 気温が下がると、方言の使用が増える傾向が見られる。 |
| 〜ば | an evaluative condition, often with a value judgment attached | 政策を見直せば、状況は改善するはずだ。 |
| 〜たら | a specific, sequential condition, often one-time or hypothetical | 調査が終わったら、結果を報告書にまとめる。 |
| 〜なら | a premise the speaker is reacting to or building on, not a cause-effect chain | その地域の言葉を研究するなら、まず現地調査が欠かせない。 |
- 条件が同じなら、結果も同じになるとは限らない。Even if the conditions are the same, it isn't necessarily the case that the results will be the same.〜なら — reacting to a stated premise, not describing a mechanical sequence
2. Fine modal distinctions: はず / に違いない / かねない / わけではない
Purpose: to mark exactly how confident, how justified, and how qualified a claim is, rather than defaulting to a flat statement or an all-purpose hedge.
- この結果は、先行研究と一致するはずだ。This result should be consistent with prior research (based on a logical expectation).〜はずだ — expectation grounded in reasoning, not direct evidence
- この表現は、若い世代には通じないに違いない。This expression is surely incomprehensible to the younger generation (strong inference).〜に違いない — confident inference approaching certainty
- この言い方は、相手を怒らせかねない。This way of putting it could well anger the other person.〜かねない — a negative possibility the speaker is warning against
- 方言を使わないからといって、その地域に愛着がないわけではない。Just because someone doesn't use the dialect doesn't mean they lack attachment to the region.〜わけではない — denying an overgeneralized implication, not the fact itself
はず and に違いない are frequently taught as near-synonyms, but at this level the distinction matters. はず expresses an expectation the speaker has reasoned their way to, and it can be undercut by new evidence without contradiction. に違いない expresses a stronger inference the speaker is prepared to stand behind. Choosing the wrong one in an academic or professional context either overstates or understates the writer's actual confidence.
3. Nominalization and clause embedding: こと versus の, and dense noun modification
Purpose: to package a clause as a noun phrase in the form that fits its predicate and register, and to build noun-modifying clauses dense enough for professional and academic prose without becoming unreadable.
- 方言が失われつつあることは、多くの研究者が指摘している。Many researchers have pointed out that dialects are gradually being lost.こと — nominalizing an abstract fact for a formal predicate (指摘する)
- 彼女が方言で話しているのを、初めて聞いた。I heard her speaking in dialect for the first time.の — nominalizing a directly perceived event for a perception verb (聞く)
- 地域社会の中で世代を超えて受け継がれてきた言い回しには、独特のニュアンスが含まれている。Expressions handed down across generations within a regional community carry a distinctive nuance.dense noun modification — a multi-layered clause modifying 言い回し
4. Passive and causative-passive: distinguishing responsibility and perspective
Purpose: to select the construction that places responsibility and viewpoint where the context requires, rather than defaulting to an active sentence out of habit.
- その方言は、若い世代に使われなくなりつつある。That dialect is increasingly not being used by the younger generation.plain passive — foregrounds the dialect, not the younger generation, as topic
- 彼は、方言で話すことを恥ずかしがらせられて育った。He was made to feel ashamed of speaking dialect as he grew up.causative-passive — marks the subject as compelled into an emotional state by an outside force
5. Deliberate topic and focus management across a paragraph
Purpose: to keep a single element as topic across several sentences, or shift it deliberately, rather than letting topic choice happen by accident sentence by sentence.
- その地域の方言は、かつて学校で使用が制限されていた。しかし近年は、逆に保存活動の対象として際立たせられるようになってきている。That region's dialect was once restricted from use in schools. In recent years, however, it has come to be foregrounded, conversely, as an object of preservation efforts.topic held across two sentences (方言), then evaluative focus shifted with 際立たせる
Grammar Practice
- Write two sentences about the same situation, one using 〜ば and one using 〜たら, and explain in English why the nuance differs.
- Write a sentence using はず and a sentence using に違いない about the same claim, and explain which one commits you to more.
- Nominalize the same clause once with こと and once with の, each attached to a predicate that requires it.
- Rewrite an active sentence about language change as a passive sentence that foregrounds the language rather than the speakers.
Model Dialogue
Setting: 山本さん reviews Emma's first draft with her at the magazine office. Polite style, mentor-colleague relationship.
Emma leaves the meeting with a revised paragraph and a clearer sense of what precision actually means at this level.
ないようりかい — Comprehension check: What problem does 山本さん identify in Emma's first sentence, and what does she change it to? What problem does he identify in her paragraph, and what structure does he suggest to fix it?
Guided Practice
タスク１ — Structure identification. Reread the Model Dialogue and identify which of this chapter's five precision systems each of 山本さん's suggestions draws on.
タスク２ — Sentence revision. Take three sentences from your own recent writing (in Japanese, from any earlier chapter's work) and revise each one using a more precise structure from this chapter.
タスク３ — Justification. With a partner, explain in Japanese why you chose one conditional, modal, or passive form over a plausible alternative in Task 2.
Listening Practice
Ask your instructor, a partner, or a text-to-speech tool to read the following short passage aloud.
きくタスク — 山本さん explains a revision principle to a group of writers
文法的に間違っていない文でも、精密さに欠けることがあります。たとえば、断定するべきでない場面で断定してしまうと、読者に誤った印象を与えかねません。逆に、はっきり言うべき場面で曖昧な表現を選ぶと、主張が弱くなってしまいます。大切なのは、その場面に最も合った言い方を選ぶことです。
聞くタスク — Listening task: Listen at least twice. (1) What kind of sentence does 山本さん say can still lack precision even without a grammar error? (2) What happens if a writer asserts something too flatly? (3) What happens if a writer hedges when they should be direct?
Speaking Practice
コントロールされた練習 — Controlled practice: Pattern drill
- ＿＿＿＿＿ば、＿＿＿＿＿はずだ。 (evaluative condition with a reasoned expectation)
- ＿＿＿＿＿は、＿＿＿＿＿に違いない。 (confident inference)
- ＿＿＿＿＿からといって、＿＿＿＿＿わけではない。 (denying an overgeneralized implication)
- ＿＿＿＿＿は、＿＿＿＿＿（さ）せられている。 (causative-passive, marking an external compelling force)
コミュニケーションタスク — Justifying a revision aloud
Choose one sentence from your Task 2 revisions above. Record yourself explaining, in Japanese, what was imprecise about the original sentence and why your revised structure fits the context better. Use at least two of this chapter's grammar patterns.
ひとりでもできる練習 — Solo practice: Minimal-pair reading
Read the はず and に違いない examples from the Grammar section aloud, back to back, exaggerating the difference in confidence between them. Record yourself and listen back once for the modal ending's prosody.
Reading Practice
Read Emma's revised paragraph below, alongside a note on what changed, and complete the questions that follow.
改訂後の段落（抜粋）
その地域の方言は、かつて学校教育の場で使用が制限されていた。標準語を話せなければ、教育を受けるうえで不利になりかねないと考えられていたためである。しかし近年は、状況が大きく変わりつつある。方言は、地域文化を象徴するものとして、逆に保存活動の対象として際立たせられるようになってきている。もっとも、こうした動きが方言の衰退そのものを止められるとは限らない。話者の高齢化が進んでいることを考えれば、今後も慎重な観察が必要だろう。
- Identify one use of 〜かねない in the passage and explain what possibility it warns about.
- Identify one passive construction and explain why the dialect, rather than the people who speak it, is kept as the topic.
- Identify the conditional used in the final sentence and explain why 〜ば fits better here than 〜たら.
- Find the phrase using 〜とは限らない and explain what claim it is carefully avoiding.
Writing Workshop
Revise a paragraph of your own writing for precision, following Emma's example.
- Select a paragraph. Choose three to five sentences from your own earlier Japanese writing, ideally on a topic related to your specialization interest from Chapter 1.
- Diagnose each sentence. For each sentence, ask whether it asserts too flatly, hedges too vaguely, uses the wrong conditional, or lets the topic shift without reason.
- Revise at least one sentence using a conditional chosen specifically for its nuance, not merely because it is grammatical.
- Revise at least one sentence using a modal expression (はず, に違いない, かねない, or わけではない) that matches your actual confidence.
- Revise at least one sentence using nominalization or dense noun modification to package information more efficiently.
- Check topic continuity across the paragraph and revise at least one sentence, if needed, using the passive to keep a consistent topic.
- Write a two-to-three-sentence note explaining, in Japanese, what changed and why.
チェックリスト — Revision checklist:
- Each revised sentence uses a structure chosen for its exact nuance, not simply an acceptable alternative.
- My conditional choices reflect the actual relationship between condition and result.
- My modal choices reflect my actual level of confidence, not a default hedge or a default assertion.
- My paragraph maintains a clear, deliberate topic rather than shifting by accident.
- My explanatory note names the specific system used in each revision.
Culture and Communication
In many Japanese professional and academic contexts, overstating a claim with excessive certainty can damage a writer's credibility as much as an outright factual error, particularly in reporting, research, and policy-adjacent writing. Careful hedging with forms such as はず, と考えられる, or とは限らない is generally read as a mark of careful thinking rather than weakness, provided the hedge itself is precise rather than vague.
Emma's article topic — regional and social language use — is exactly the kind of subject where imprecise modality can cause real harm, since flat claims about who speaks a dialect and why can flatten real diversity within a community. This chapter's precision systems will return directly in Chapter 13, when the volume examines regional, historical, and multilingual Japanese in depth.
Common Mistakes to Avoid
Error: Selecting whichever conditional feels most familiar, regardless of whether the sentence describes a general truth, an evaluative condition, a sequential event, or a reaction to a premise.
Correction: Ask what relationship the sentence actually expresses, then choose accordingly: その分野を研究するなら、現地調査は欠かせない。 (reacting to a premise, not a mechanical result).
Error: Using 〜に違いない for a claim that is really only a reasoned expectation, making the writing sound more certain than the evidence supports.
Correction: Reserve 〜に違いない for genuinely strong inference, and use 〜はずだ for reasoned expectation that could be revised by new evidence.
Error: Switching the grammatical subject from sentence to sentence without a discourse reason, forcing the reader to track several shifting topics at once.
Correction: Hold a single topic across related sentences using the passive when needed, as in Emma's revision: 方言は、〜使用が制限されていた。しかし近年は、〜際立たせられるようになってきている。
Chapter Review
Section A — ごい (Vocabulary)
1. Complete the Core Vocabulary practice above.
Section B — もじ (Script)
1. Complete the Script and Terminology Focus practice above.
Section C — ぶんぽう (Grammar)
1. Complete the Grammar Practice exercises above.
Section D — どっかいりかい (Reading comprehension)
1. Complete the Reading Practice questions above.
Section E — かくこと (Writing)
1. Complete all seven steps of the Writing Workshop, as part of the Performance Task below.
Section F — はなすこと (Speaking)
1. Complete the spoken justification recording from Speaking Practice, as part of the Performance Task below.
Performance Task
パフォーマンスタスク
精密さの練習：段落の改訂 — Revising a Paragraph for Precision
Complete all four parts below to demonstrate precise grammar control across this chapter's four systems.
- Listening: Complete the Listening Practice task above and summarize 山本さん's revision principle in your own words.
- Reading: Answer the Reading Practice questions about Emma's revised paragraph.
- Spoken production: Deliver your recorded justification from Speaking Practice, explaining a revision using at least two of this chapter's grammar patterns.
- Written production: Submit your complete revised paragraph and explanatory note from the Writing Workshop, checked against the checklist above.
Assessment focus: precision and appropriateness of conditional choice; accuracy of modal and stance distinctions; correct nominalization and clause embedding; deliberate, justified topic management; and accurate particles, register, and mixed-script control throughout spoken and written work.
Answer Key
Core Vocabulary
Open-ended; check that each sentence uses the target word accurately and describes the learner's own writing process.
Script and Terminology Focus
Open-ended; check that five predicates are written correctly and that each okurigana error is paired with a plausible resulting misreading.
Grammar Practice
Open-ended; model answers: (1) 丁寧に説明すれば、相手は納得するはずだ。 versus 丁寧に説明したら、相手は納得した。 — the first is a general evaluative condition, the second a specific, completed sequence. (2) この結果は正しいはずだ。 (reasoned expectation) versus この結果は正しいに違いない。 (strong inference). (3) 彼が方言を話すことに気づいた。 versus 彼が方言を話しているのを見た。 (4) その方言は、若い世代に使われなくなりつつある。
Model Dialogue — Comprehension Check
山本さん identifies that Emma's opening sentence asserts too flatly given her actual evidence, and suggests changing it to 使われなくなりかねない. He identifies that her paragraph's subject shifts from sentence to sentence, and suggests keeping 方言 as a consistent topic using the passive.
Guided Practice
Open-ended; evaluate against the five precision systems named in the Grammar section: conditionals, modality/stance, nominalization, embedding, and passive/causative.
Listening Practice — Model answers
(1) A grammatically correct sentence can still lack precision. (2) Asserting something too flatly can give readers a mistaken impression. (3) Choosing a vague expression when directness is called for weakens the writer's argument.
Reading Practice
(1) 不利になりかねない warns of the possibility that not speaking standard Japanese could disadvantage a student's education. (2) 使用が制限されていた and 際立たせられるようになってきている keep the dialect, not the institutions or communities acting on it, as the topic throughout. (3) 考えれば — the sentence draws an evaluative conclusion from a consideration, which fits 〜ば better than the specific, one-time nuance of 〜たら. (4) 止められるとは限らない avoids claiming that preservation efforts definitely cannot succeed, while still avoiding a confident claim that they will.
Chapter Review — Sections A through D
Open-ended; check against the Core Vocabulary, Script and Terminology Focus, Grammar Practice, and Reading Practice sections above.
Chapter Review — Sections E and F, and Performance Task
These are open-ended, integrated production tasks. Evaluate the revised paragraph and the recorded spoken justification against the assessment focus listed under the Performance Task above.
Looking Ahead
いまできること — What you can do now
You can choose among conditionals, modal expressions, nominalization strategies, and passive/causative constructions based on exactly what a context requires, and you can revise a piece of your own writing to remove imprecision without introducing grammatical errors. This precision work will carry directly into your ongoing article draft and into the vocabulary and collocation work of the next chapter.