Index C: By Communicative Function

Patterns grouped by what they do in communication. An entry may appear under more than one function if it serves multiple communicative roles.

Asserting or informing

1.1: だ（述語） — plain copula as casual assertion for nouns and な-adjectives
1.2: ∅（い形容詞文末） — bare い-adjective as complete predicate
1.5: 〜た — plain past as casual assertion of completed events
3.1: 〜んだ / 〜んです — explanatory frame marking background context or reason
3.3: 〜んだよ — insistent or frustrated explanation pushed at the listener
3.7: 〜の（文末, 説明） — soft explanatory statement with feminine tendency
4.2: よ — informing particle that pushes new information toward the listener
4.8: さ（文末 / 文中） — casual, low-stakes assertion with masculine tendency
4.10: ぞ — strong masculine assertion, determination, or warning
4.11: ぜ — friendly masculine assertion with inclusive energy
4.9: わ（東京） — soft feminine assertion signalling gentle conclusion
5.13: っす / す — casual-polite hybrid copula in semi-formal male speech

Expressing obligation

5.8: 〜なきゃ（いけない） — contracted obligation from なければならない
5.9: 〜なくちゃ — contracted obligation from なくては, slightly softer nuance

Expressing uncertainty or hedging

1.8: 〜だろう / 〜だろ — conjecture ("probably") or assertive confirmation-seeking
6.1: 〜かもしれない / 〜かも — pure uncertainty ("might")
6.2: 〜みたい（だ） — evidential inference ("it seems like") based on observation
6.3: 〜らしい — hearsay or typicality ("apparently" / "-like")
6.5: 〜っぽい — subjective impression ("-ish", "-like")
6.6: とか — vague listing or hedging a single item ("or something")
6.7: なんか — bleached discourse filler that softens whatever follows ("like")
6.8: 〜みたいな（文末） — trailing approximator dissolving assertive force ("or whatever")
6.9: 一応（いちおう） — qualifying a claim as technically true but not fully satisfactory
6.10: 〜って感じ — vague impression framing ("that kind of vibe")
6.11: まあ / まぁ — discourse softener signalling concession or reluctant acceptance
6.12: 〜ていうか / 〜というより — mid-sentence self-correction ("or rather")

Seeking confirmation or shared understanding

3.4: 〜んだね / 〜んだよね — confirming shared understanding of a situation
3.6: 〜んじゃないか / 〜んじゃん — rhetorical confirmation ("obviously, right?")
4.1: ね / ねえ — confirmation-seeking or shared-orientation particle
4.3: よね — assertion softened by invitation to agree
4.5: っけ — memory-retrieval particle ("was it...?", "what was it again?")
6.4: 〜じゃん / 〜じゃないか — confirmation particle presupposing shared knowledge

Leaving a request implicit

3.2: 〜んだけど（文末） — explanatory frame trailing off to imply a request or bid for help
7.1: 〜けど（文末） — trailing conjunction leaving the request or contrast unstated
7.5: 〜なんだけど（文末） — standard indirect request form combining んだ and trailing けど

Making requests and suggestions

1.6: 〜よう / 〜ようか — plain volitional for suggestions or invitations ("let's")
1.7: 〜て / 〜てよ / 〜てくれ — casual request spectrum from soft to blunt

Expressing frustration, surprise, or emotional charge

3.3: 〜んだよ — insistent explanation, often with frustration or correction
3.8: 〜のに（逆接） — concessive with frustration or disappointment ("even though...")
4.7: もん / もの — justification with emotional defiance or childlike insistence ("because!")
8.2: だから（文頭） — emphatic sentence-opener meaning "I'm telling you" or "that's what I said"

Marking speech as reported or second-hand

3.5: 〜んだって — casual hearsay form for relaying what someone else said
6.3: 〜らしい — reporting secondhand information ("apparently")

Managing turns: opening, continuing, closing

8.1: じゃあ / じゃ — topic-closing pivot or consequence-drawing connector
8.3: でも（文頭） — sentence-initial contradiction or pushback
8.4: それで / で — narrative continuation connector ("and then")
8.5: えっと / えーと / うーん — turn-holding fillers while thinking
8.6: あの（う） — hesitation marker, attention bid, or request hedger
8.7: はい / ええ / うん / ああ — backchannel signals showing active listening
8.8: っていうか（文頭） — discourse redirect reframing the conversation
8.9: ていうか〜みたいな — vague reframe cluster for approximate impressions

Expressing completion or regret

5.3: 〜ちゃう / 〜じゃう — contracted completion/regret ("ended up doing")
5.4: 〜ちゃった / 〜じゃった — past completion/regret ("accidentally did")

Softening or approximating

1.3: ∅（述語省略） — dropping the copula だ for a softer, less assertive predicate
6.1: 〜かも — truncated uncertainty ("might") softening a claim
6.6: とか — hedging a suggestion by implying vagueness
6.7: なんか — discourse-level softener reducing directness
6.8: 〜みたいな（文末） — trailing approximator making a statement non-committal
6.9: 一応（いちおう） — downplaying achievement or certainty
6.11: まあ / まぁ — concessive softener
4.1: ね / ねえ — social lubricant softening any statement

Wondering or deliberating aloud

4.4: かな / かなあ — self-directed wondering particle ("I wonder if...")
7.6: 〜かな（独り言） — thinking aloud, deliberating without directing a question at anyone

Narrating and trailing off

7.2: 〜し（文末） — trailing off with a single reason implying resignation
7.3: 〜て / 〜で（未完） — narrative trail-off at a て-form, leaving consequence unstated
7.4: 〜し〜し〜し — accumulated reasons trailing off without a conclusion

Describing ongoing states and preparatory actions

5.1: 〜てる / 〜でる — contracted progressive/resultative ("is doing" / "has done")
5.2: 〜てない — contracted negative progressive ("hasn't done")
5.5: 〜とく / 〜どく — contracted preparatory action ("do in advance")
5.6: 〜といた / 〜どいた — past preparatory action ("did in advance")
5.7: 〜てく — contracted directional ("do and go")

Negating casually

1.4: 〜ない — plain negative as casual sentence-ender
5.10: 〜じゃない / 〜じゃん — contracted copula negation, or confirmation particle
5.11: わかんない — phonological compression of わからない (and the productive ら→ん rule)

Dropping elements for natural flow

2.1: ∅ + 述語（ゼロ主題） — topic omitted entirely, recovered from context
2.2: ∅ + 状態動詞 — が-marked subject dropped with stative verbs
2.3: は省略（主題連鎖） — topic persists silently across turns once established
2.4: を省略（目的語） — direct object particle を dropped in casual speech
2.5: 後置き（主題後置） — topic appended after the predicate as an afterthought
2.6: 動詞先行倒置 — verb-first inversion for urgency or real-time assembly

Asking questions casually

1.9: 〜？（上昇調） — rising intonation alone forms a question, no か needed
1.10: 〜の？ / 〜の — の-marked question adding personal investment or surprise

Compressing conditional forms

5.12: 〜りゃ / 〜きゃ / 〜みゃ — compressed ば-conditional with masculine/rough tendency

Self-directed reflection

4.6: な / なあ — introspective particle oriented inward rather than toward the listener