6.1 Modality, Conjectures & Hearsay: Sōda, Yōda/Mitaida, Rashii, Kamoshirenai & Hazuda

Modality, Conjectures & Hearsay: Sōda, Yōda/Mitaida, Rashii, Kamoshirenai & Hazuda

Core Principle: Japanese modality expressions (様態・推量・伝聞の助動詞) reflect the speaker's subjective assessment of reality, their source of information, and their level of cognitive certainty. Rather than simply stating facts, modality markers indicate whether an assertion stems from direct visual impression (〜そうだ), sensory or circumstantial deduction (〜ようだ / 〜みたいだ), indirect evidential hearsay or typicality (〜らしい), speculative possibility (〜かもしれない), or rigorous logical deduction (〜はずだ).

On the JLPT N4, modality questions are tested across Grammar Mondai 1 (Form Selection), Mondai 2 (Sentence Composition ★), and Reading/Listening comprehension. Mastering these structures requires rigorous attention to morphological connection rules (stems vs. plain forms) and evidential sources.

---

1. The Epistemic Certainty Spectrum

To navigate Japanese modality, conceptualize each auxiliary ending along a continuous spectrum of speaker certainty and evidential grounding:

SPEAKER CERTAINTY & EVIDENCE SPECTRUM
┌─────────────────────────────────────────────────────────────────────────────┐
│ [30%–50% Possibility]  [60%–75% Inference]   [80% Hearsay]  [90%+ Deduction]│
│                                                                             │
│ 〜かもしれない         〜ようだ / 〜みたいだ   〜らしい       〜はずだ        │
│ (Bare possibility;     (Sensory clues,        (Indirect      (Logical       │
│  no firm proof)         observed signs)        reports, buzz) necessity)    │
├─────────────────────────────────────────────────────────────────────────────┤
│ [Immediate Visual Impression]                [Verbatim / Formal Hearsay]    │
│                                                                             │
│ 〜そうだ (Stem Attachment)                    〜そうだ (Plain Form)          │
│ "Looks about to / Appears..."                "I hear from a source that..." │
└─────────────────────────────────────────────────────────────────────────────┘

---

2. Visual Conjectural 〜そうだ vs. Hearsay 〜そうだ

The single most heavily tested modality contrast on the JLPT N4 is the morphological and semantic division between Visual Conjectural 〜そうだ (様態) and Hearsay Reporting 〜そうだ (伝聞).

Visual Conjectural 〜そうだ   ──→  ATTACH TO STEMS (連用形 / 語幹)  ──→ "Looks like / About to"
Hearsay Reporting 〜そうだ    ──→  ATTACH TO PLAIN FORM (普通形)   ──→ "I hear that / Said to be"

A. Visual Conjectural 〜そうだ (Visual Appraisal & Imminent State)

Visual 〜そうだ indicates that the speaker observes an entity or situation and makes an immediate, intuitive conjecture based solely on its external visual appearance or senses an event is on the verge of occurring.

1. Morphological Attachment Rules

• Verbs (Masu-stem / 連用形):
  • 降る → 降りそうだ (It looks like it is about to rain)
  • 落ちる → 落ちそうだ (It looks like it is about to drop/fall)
  • 倒れる → 倒れそうだ (It looks like it is about to collapse)
  • 壊れる → 壊れそうだ (It looks like it is about to break)
• い-Adjectives (Drop final い):
  • おいしい → おいしそうだ (Looks delicious)
  • 辛い → 辛そうだ (Looks spicy)
  • 忙しい → 忙しそうだ (Looks busy)
  • 暑い → 暑そうだ (Looks hot)
• な-Adjectives (Word Stem / Drop な):
  • 元気な → 元気そうだ (Looks energetic/healthy)
  • 暇な → 暇そうだ (Looks free/unoccupied)
  • 親切な → 親切そうだ (Looks kind)
  • 丈夫な → 丈夫そうだ (Looks sturdy/durable)

2. Critical Irregular Stem Exceptions (High-Yield N4 Traps)

Two indispensable adjectives form irregular conjectural stems that appear constantly in Mondai 1:

• いい / よい (Good): Stem becomes よさ → よさそうだ (NOT いそうだ, NOT よいそうだ).
  • この本はとてもよさそうですね。(This book looks very good.)
• ない (Negative / Non-existent): Stem becomes なさ → なさそうだ (NOT ないそうだ).
  • 今日の午後は雨が降らなさそうだ。(It does not look like it will rain this afternoon.)
  • この料理はあまり辛くなさそうだ。(This dish does not look very spicy.)

3. Syntactic Usage as Modifiers

Visual 〜そうだ inflects like a な-adjective when modifying subsequent elements:

• Modifying a Noun (〜そうな + Noun):
  • おいしそうなケーキ (A delicious-looking cake)
  • 泣きそうな顔 (A face that looks about to cry)
• Modifying a Verb or Adjective (〜そうに + Verb):
  • 子供たちが楽しそうに遊んでいる。(The children are playing happily/looking like they are having fun.)
  • 寒そうにセーターを着た。(Put on a sweater, looking cold.)

4. Semantic Constraints (What CANNOT take Visual 〜そうだ)

• Direct Visual Properties: Inherent visual facts that require no conjecture cannot take visual 〜そうだ. For example, you cannot say *赤そうだ (looks red) because redness is directly observed, not conjectured. Say 赤いようだ or 赤い色をしている.
• Direct Emotions of Self: You cannot use 〜そうだ for your own internal sensations (*私は寒そうだ is ungrammatical; say 私は寒い).

---

B. Hearsay Reporting 〜そうだ (Transmitting External Information)

Hearsay 〜そうだ reports information acquired from an external source (news, another person, a notice) without modifying the factual claim with personal opinion.

1. Morphological Attachment Rules (Attached to Full Plain Forms / 普通形)

• Verbs (Plain Form — Present/Past/Negative):
  • 明日雨が降るそうだ。(I hear it will rain tomorrow.)
  • 田中さんは会社を辞めたそうだ。(I hear Tanaka quit the company.)
  • 明日は来ないそうだ。(I hear they will not come tomorrow.)
• い-Adjectives (Plain Form):
  • あの店のケーキはとてもおいしいそうだ。(I hear the cake at that shop is delicious.)
  • 昨日の試験は難しかったそうだ。(I hear yesterday's exam was difficult.)
• な-Adjectives (Attach だ in Present Affirmative):
  • 山田先生はとても暇だそうだ。(I hear Professor Yamada is free.)
  • そのホテルは静かだったそうだ。(I hear that hotel was quiet.)
• Nouns (Attach だ in Present Affirmative):
  • 明日は休みだそうだ。(I hear tomorrow is a day off.)
  • 彼は以前、医者だったそうだ。(I hear he was previously a doctor.)

2. Source-Marker Collocation: 〜によると (According to...)

Hearsay 〜そうだ frequently pairs with the source particle compound 〜によると at the start of a sentence:

• 天気予報によると、明日は午後から大雨が降るそうだ。(According to the weather forecast, I hear it will rain heavily starting tomorrow afternoon.)
• 部長の話によると、来月新しい支店ができるそうだ。(According to the department manager, I hear a new branch office will be established next month.)

---

Master Comparison: Visual vs. Hearsay Sōda

---

3. Sensory & Inferential Likeness: 〜ようだ vs. 〜みたいだ

Both 〜ようだ (formal/written register) and 〜みたいだ (informal/conversational register) express subjective conjecture based on multi-sensory evidence (sight, sound, touch, smell, circumstantial context) or express figurative resemblance / simile.

Two Core Semantic Functions:
  1. Inferential Conjecture: "Judging by the evidence, it appears that..."
     Example: 外で車の音がした。誰かが来たようだ。(Heard a car sound; it seems someone came.)

  2. Figurative Resemblance: "X is like Y (metaphorical comparison)"
     Example: 彼女は太陽のように明るい。(She is bright like the sun.)

A. Morphological Formations

B. Sensory Evidence vs. Visual Impression

Contrast 〜そうだ with 〜ようだ / 〜みたいだ:

• おいしそうだ: Visual impression only. Looking at the glossy icing on a cake: "That cake looks tasty!"
• おいしいようだ / おいしいみたいだ: Inferred from broader circumstances. Looking at an empty plate, smelling the aroma, or noticing a line of 50 people outside a restaurant: "Judging by the huge queue, it appears the food is delicious."

---

4. Evidential Conjecture & Prototypicality: 〜らしい

〜らしい fulfills two distinct functions in JLPT N4 grammar that must be carefully distinguished by their syntactic structure.

Function 1: Evidential Inference / Rumor ("Apparently / Seemingly")
            [Plain Form (N/Na-adj drop だ)] + らしい
            Example: 田中さんは来月結婚するらしい。(Apparently, Tanaka is getting married next month.)

Function 2: Quintessential Typicality ("Truly behaving like a prototypical [Noun]")
            [Noun] + らしい
            Example: 彼は男らしい。(He is manly / acts with true manly qualities.)

A. Evidential Inference (Based on Reliable Circumstantial Reports)

Attached to plain forms (with Nouns and な-adjectives taking NO だ):

• Verbs: 彼は明日帰国するらしい。(Apparently he is returning to his home country tomorrow.)
• い-Adj: 今年の冬は寒いらしい。(Apparently this winter will be cold.)
• な-Adj: あの先生は親切らしい。(Apparently that teacher is kind. NOT 親切だらしい)
• Nouns: 明日は雨らしい。(Apparently tomorrow is rain. NOT 雨だらしい)

Nuance Difference (Hearsay そうだ vs. Evidential らしい): Hearsay 〜そうだ merely parrots an external message ("X told me that..."). Evidential 〜らしい integrates external information with the speaker's own assessment ("Based on what I've seen and heard, it seems to be the case").

B. Prototypical Typicality (Noun + らしい)

When attached directly to a noun, 〜らしい asserts that the entity embodies the ideal, authentic, or quintessential attributes of that category:

• 子供らしい子供: A child who acts in a wonderfully childish, energetic, innocent way.
• 男らしい態度: A manly, dependable attitude.
• 春らしい天気: Truly spring-like weather (warm, floral, sunny in April).

CRITICAL JLPT CONTRAST: Noun + のようだ  vs.  Noun + らしい

1. Noun + のようだ (Metaphor / False Category Comparison):
   あの男の人は女のようだ。
   (That man is like a woman. → Fact: He is a man, but figuratively resembles a woman.)

2. Noun + らしい (True Quintessential Membership):
   あの男の人は男らしい。
   (That man is manly. → Fact: He is a man, and exhibits exemplary masculine behavior.)

---

5. Certainty Extremes: 〜かもしれない vs. 〜はずだ

A. 〜かもしれない (Low Probability: 30%–50% "Might / May")

Expresses that a possibility cannot be completely ruled out, even without solid supporting proof.

• Conjugation Rules: Attach directly to plain forms; Nouns and な-adjectives drop だ.
  • Verb: 雨が降るかもしれない (It might rain)
  • い-Adj: 高いかもしれない (It might be expensive)
  • な-Adj: 暇かもしれない (NOT 暇だかもしれない)
  • Noun: 病気かもしれない (NOT 病気だかもしれない)
• Polite Form: 〜かもしれません
• Casual Spoken Form (Listening): 〜かも (e.g., 明日行くかも)

B. 〜はずだ (High Logical Deduction: 90%+ "Should / Ought to")

Expresses strong objective conviction based on definite schedules, reliable facts, logical deduction, or natural laws.

• Conjugation Rules:
  • Verb: Plain Form + はずだ (来るはずだ / 来たはずだ)
  • い-Adj: Plain Form + はずだ (安いはずだ)
  • な-Adj: Stem + な + はずだ (静かなはずだ)
  • Noun: Noun + の + はずだ (休みのはずだ)
• Negative Forms:
  • 〜ないはずだ: Weak expectation of non-occurrence (He probably won't come).
  • 〜はずがない: Absolute logical impossibility (There is no way that... / It cannot be!).
    • まだ子供ですから、そんな難しい漢字が読めるはずがありません。(Since he is still a child, there is no way he can read such difficult kanji.)