Section 2: Topic, Subject, and Object Drop

Japanese does not drop elements carelessly — it drops them systematically. The reason learners struggle with natural speech is not that speakers are "leaving things out" but that textbooks present full, particle-marked sentences as the default, when in reality the default is the opposite. A sentence like 私はコーヒーが好きです is a textbook artifact; in actual conversation, 好き alone carries the same meaning once context is established. This section covers the six core patterns of element dropping and reordering: zero-topic sentences, subject omission with stative verbs, topic-chain deletion, object particle drop, postposed topics, and verb-first inversion. These patterns interact constantly — a single natural utterance may combine two or three of them. Understanding this section is a prerequisite for parsing almost anything in Parts II through V, because the patterns taught there are almost always delivered inside a dropped-element frame.

2.1 ∅ + 述語（ゼロ主題）

← 教科書の形: [主題]は + 述語

Formula: [主題は] + [述語] → ∅ + [述語]

Register: ★★★ core Medium: spoken — all

Gap Note

Genki I introduces は as the topic marker in Lesson 1 and proceeds to build every example sentence with an explicit topic. Minna no Nihongo follows the same approach. Neither textbook states clearly that in most casual conversation, the topic is not spoken at all — it is recovered from context by both speaker and listener. The result is that learners hear a bare predicate like 行く？ and stall, searching for a subject that was never uttered. The failure mode is not grammar — it is the expectation that every sentence must begin with a topic.

How the transformation works

In casual Japanese, the topic is omitted whenever both speaker and listener can identify it from the conversational context — shared physical environment, the flow of prior turns, or cultural common ground. This is not a contraction or abbreviation. It is the unmarked, default sentence structure of spoken Japanese. The full topic-marked sentence is the marked form, used for emphasis, contrast, or topic shift.

Examples

[casual / one friend to another, leaving the house together] 行く？ "Are we going?"

[casual / couple at home, evening] 疲れた。 "I'm tired." (speaker = topic, understood)

[casual / coworker to coworker, after a meeting] 長かったね。 "That was long, huh." (meeting = topic, inferred from shared experience)

[casual / friends watching TV, one reaches for the remote] 変える？ "You changing it?" (combines ∅ topic with plain-form question, → 1.9)

[casual / friend asks 明日暇？, response:] 暇。 "I'm free." (both topic 私 and copula dropped; → 1.3)

[polite equivalent for comparison] 明日はお暇ですか？ → 明日暇？ "Are you free tomorrow?"

Dialogue

[casual / two university friends, A female, B male, texting about weekend plans]

A: 明日なにする？　[What are you doing tomorrow?]

B: まだ決めてない。　[Haven't decided yet.]

A: 映画行かない？　[Wanna go to a movie?]

B: いいね。何見る？　[Sounds good. What should we watch?]

Variations

∅ + 感情表現（感嘆） Formula: [主題は] + [感情述語] → ∅ + [感情述語] [casual / someone tasting food at a restaurant] うまっ。 "This is good!" (topic = the food; spontaneous reaction)

Contrast with

2.5: 後置き（主題後置） — topic is not absent, but delayed until after the predicate

Written note

→ See Appendix C.1: Particle drop in text for the written-casual realization of this pattern.

2.2 ∅ + 状態動詞

← 教科書の形: [主語]が + 状態動詞

Formula: [主語が] + [状態動詞] → ∅ + [状態動詞]

Register: ★★★ core Medium: spoken — all

Gap Note

Genki I teaches 分かる, ある, and いる with が as the subject marker and drills the [N]が + [状態動詞] frame repeatedly. JLPT N4 grammar lists treat が-marking as essential to these verbs' identity. What neither source explains is that in casual speech, the が-marked subject is almost always absent. A speaker says 分かる, not それが分かる. Learners who have internalized "分かる takes が" hear the bare verb and either freeze looking for the が-phrase or misidentify the sentence structure entirely.

How the transformation works

Stative verbs — verbs that describe a state rather than an action — have subjects that are typically obvious from context: the thing being discussed (分かる), the thing whose existence is relevant (ある), or the person/thing whose presence matters (いる). Because the referent is already active in the conversation, the が-marked subject drops. This applies broadly to stative predicates including 要《い》る, 足《た》りる, and できる.

Examples

[casual / student to classmate, after teacher's explanation] 分かる？ "Do you get it?"

[casual / someone looking in the fridge] ある、ある。 "Yeah, it's here." (item being looked for = understood subject)

[casual / couple in apartment, one asks about the cat] いる？ — いるよ。 "Is she here?" — "Yeah, she's here."

[casual / friend offering to help with a task] できる？ "Can you do it?" (combines ∅ subject with plain-form question, → 1.9)

[casual / at a convenience store, checking wallet] 足りる？ — うん、大丈夫。 "Is it enough?" — "Yeah, it's fine."

[polite equivalent for comparison] お金が足りますか？ → 足りる？ "Is the money sufficient?"

Dialogue

[casual / two friends, A and B, at A's apartment, looking for something]

A: あれ、リモコンどこ？　[Huh, where's the remote?]

B: さっきそこにあったけど。　[It was right there a second ago, though.] (→ 7.1 trailing けど)

A: ない。　[It's not here.]

B: ソファの下見た？　[Did you check under the couch?] (→ 2.4 を省略)

A: あ、あった。　[Oh, found it.]

Variations

∅ + 要る Formula: [N が] + 要る → ∅ + 要る [casual / someone packing for a trip, partner asks about an item] 要る？ — 要らない。 "Do you need it?" — "Nah."

Contrast with

2.4: を省略（目的語） — object particle drop targets を, not が; different structural slot

2.3 は省略（主題連鎖）

← 教科書の形: [主題]は…。[主題]は…。

Formula: [主題は] + [述語₁]。[主題は] + [述語₂] → [主題は] + [述語₁]。∅ + [述語₂]

Register: ★★★ core Medium: spoken — all

Gap Note

Genki I and II present は in every example sentence and drill it as the marker that opens a clause. Students learn to produce は-marked topics reliably — too reliably. Neither Genki nor Minna no Nihongo explains that once a topic has been established, it does not reappear until a new topic is introduced. The failure mode is subtle: learners hear a sequence of bare predicates across several turns and lose track of what is being talked about, because they are waiting for a は to re-anchor the topic. In listening comprehension, this creates a cascading parsing failure across entire exchanges.

How the transformation works

Japanese conversation operates on a topic-chain principle. When a topic is set — either by an explicit は-marked phrase or by the situation itself — that topic persists silently across all subsequent utterances until something displaces it. A new は signals a topic shift; the absence of は signals continuation. The chain can span many turns between speakers.

Examples

[casual / telling a friend about a restaurant] あの店、雰囲気《ふんいき》いいし、料理もうまいし。 "That place, the vibe is good, the food is good too." (あの店 sets topic; second clause has no は)

[casual / friends discussing a mutual acquaintance] 田中、最近忙しいらしい。全然連絡来ない。 "Tanaka's apparently been busy lately. Haven't heard from him at all." (田中 topic chains into second sentence)

[casual / describing a new phone] これ、軽いし、カメラもいいし、電池も持つし。 "This one — it's light, the camera's good, the battery lasts." (これ sets topic for all three し-clauses; → 7.4)

[casual / conversation about weekend, B continues A's topic] A: 昨日のパーティーどうだった？ B: 楽しかった。人多かったけど。 "A: How was yesterday's party? B: It was fun. Crowded, though." (パーティー stays topic across speakers; → 7.1)

[casual / two turns, topic shifts] 田中は来た。山田はまだ。 "Tanaka came. Yamada, not yet." (は reappears to signal contrast/shift)

Dialogue

[casual / two coworkers, A and B, Monday morning]

A: 週末どうだった？　[How was your weekend?]

B: 土曜はずっと寝てた。　[Saturday I was sleeping the whole time.] (→ 5.1 〜てる)

A: 日曜は？　[Sunday?] (は signals topic shift)

B: 買い物行って、映画見て。　[Went shopping, saw a movie.] (→ 7.3 trailing て)

A: いいね。　[Nice.]

Contrast with

2.5: 後置き（主題後置） — topic placed after predicate, not dropped from chain

2.4 を省略（目的語）

← 教科書の形: [目的語]を + 動詞

Formula: [N を] + [V] → [N] + [V] / ∅ + [V]

Register: ★★★ core Medium: spoken — all

Gap Note

Genki I introduces を as the direct-object marker in Lesson 3 and uses it consistently in all example sentences through both volumes. JLPT N4 grammar tests penalize its absence. The result is that learners hear コーヒー飲む？ and either mentally insert を out of habit (which works) or stumble because the sentence "doesn't have a particle." More seriously, when the object itself is dropped and only the verb remains — 飲む？ — the learner has lost two elements at once (object + particle) and may not realize an object was ever implied. Minna no Nihongo never addresses particle drop as a systematic phenomenon.

How the transformation works

In casual speech, を is the most frequently dropped particle. It disappears in two stages: first, を is simply absent while the noun remains (ご飯食べる); second, both the object noun and を are absent when the referent is contextually obvious (食べる？). The drop is almost categorical in spoken Japanese — retaining を in casual speech can sound stiff or overly precise.

Examples

[casual / parent to child, dinnertime] ご飯食べなさい。 "Eat your dinner." (ご飯 present, を absent)

[casual / friend to friend, at a café] コーヒー飲む？ "Want coffee?" (コーヒー present, を absent)

[casual / friend holds up a book and asks] 読んだ？ "Did you read it?" (both object and を absent; referent = the book being held up)

[casual / two friends talking about a movie trailer they both saw online] 見た？すごかったよね。 "Did you see it? It was amazing, right?" (object dropped; → 4.3 よね)

[casual / suggesting karaoke, one friend to another] 歌おうよ。 "Let's sing." (no object; volitional + よ → 1.6, 4.2)

[polite equivalent for comparison] この本を読みましたか？ → これ読んだ？ "Did you read this book?"

Dialogue

[casual / two friends, A and B, leaving a convenience store]

A: 弁当《べんとう》買った？　[Did you buy a bento?]

B: 買った。おにぎりも。　[Yeah. Onigiri too.]

A: 飲み物は？　[Drinks?] (は for contrastive topic shift)

B: あ、忘れた。　[Oh, forgot.] (object 飲み物を dropped; → 2.1)

A: 俺のもらっていい？　[Can I have some of yours?] (→ 2.4 を dropped after 俺の)

Contrast with

2.3: は省略（主題連鎖） — は drops because topic persists; を drops because the object-verb relationship is obvious regardless

Written note

→ See Appendix C.1: Particle drop in text for the written-casual realization of this pattern.

2.5 後置き（主題後置）

← 教科書の形: [主題]は + [述語]

Formula: [述語]（？） + [主題] → predicate first, topic appended

Register: ★★★ core Medium: spoken — all

Gap Note

No major N4 textbook — not Genki, not Minna no Nihongo, not Tobira's introductory chapters — addresses postposed topics. Japanese word order is presented as [topic] は [comment] with the verb at the end, and this is treated as fixed. Learners encounter 食べた？昨日買ったアイス and parse it as two unrelated fragments: "Did you eat?" and "The ice cream I bought yesterday?" — failing to recognize that the second piece is the topic of the first. This is one of the most common parsing failures in real-time listening, because the learner's grammar expects the topic before the predicate, not after.

How the transformation works

In casual spoken Japanese, speakers frequently say the predicate first — the verb, adjective, or question — and then append the topic as an afterthought. This is not an error or sloppy speech. It reflects how real-time conversation works: the speaker delivers the communicative point (the question, the reaction, the comment) immediately, then clarifies the referent. Intonation links the two pieces — the predicate carries a slight rise or suspension, and the postposed topic follows without a pause, completing the utterance.

Examples

[casual / one friend to another, pointing at food on the table] 食べた？昨日買ったアイス。 "Did you eat it? The ice cream I bought yesterday."

[casual / someone coming home, noticing something] 届《とど》いた？あの荷物《にもつ》。 "Did it arrive? That package."

[casual / watching a drama together] かっこいいね、この人。 "He's cool, this guy." (adjective + ね first; → 4.1)

[casual / texting about plans] 行く？来週のやつ。 "You going? The thing next week."

[casual / reacting to news a friend shared] やばくない？それ。 "Isn't that crazy? That." (predicate + question first, referent appended; → 1.4)

Dialogue

[casual / two friends, A and B, at home, A just came back from shopping]

A: 買っちゃった。新しいの。　[I ended up buying it. A new one.] (→ 5.4 〜ちゃった)

B: え、マジで？何それ。　[Wait, seriously? What's that?]

A: ヘッドフォン。前のやつ壊《こわ》れたから。　[Headphones. Because my old ones broke.]

B: 高かった？　[Were they expensive?]

A: まあまあ。でもいい音するよ。　[So-so. But they sound good.]

Variations

後置き + 否定疑問 Formula: [V-ない？] + [主題] [casual / friend pointing at a stain on another's shirt] 気づいてなかった？これ。 "You didn't notice? This." (negative + past, topic appended)

Contrast with

2.3: は省略（主題連鎖） — in topic chains, the topic is simply absent; here the topic is present but displaced

2.6 動詞先行倒置

← 教科書の形: [主題]は + [動詞]

Formula: [V]（？） + [主題]（？） → verb fires first, topic may follow as a separate intonation unit

Register: ★★★ core Medium: spoken — all

Gap Note

Verb-first inversion is completely absent from Genki I, Genki II, Minna no Nihongo, and standard JLPT preparation materials. These textbooks present SOV order as the grammar of Japanese, not merely its default. When learners hear 見た？あの人？, they parse 見た as a complete sentence ("I saw [something]") and あの人 as a new, unconnected fragment. The inversion goes unrecognized because the learner has no mental model that permits a Japanese sentence to begin with a verb. The comprehension failure is total — not a misreading of nuance, but a structural misparse.

How the transformation works

Verb-first inversion places the verb or predicate at the very beginning of the utterance, with the topic, object, or other elements following as separate intonation units — often with rising intonation on each piece, as if the speaker is assembling the sentence in real time. This differs from postposed topics (2.5) in degree: in 2.5, the predicate leads and the topic is appended as a clarifying afterthought. In 2.6, the entire sentence is reordered — verb first, then the remaining elements trickle in. This pattern is most common in questions and exclamations, where the verb carries the communicative urgency.

Examples

[casual / two friends at a park, one spots someone] 見た？あの人？ "Did you see? That person?"

[casual / someone enters the room excited] 知ってる？明日の話。 "Did you hear? About tomorrow." (→ 5.1 〜てる)

[casual / reacting to a sudden noise] 聞こえた？今の。 "Did you hear that? Just now."

[casual / friend asking about plans with urgency] 決めた？場所。 "Did you decide? The place."

[casual / at a restaurant, waiter is coming] 選んだ？何頼《たの》む？ "Did you pick? What are you ordering?" (double inversion; second question also verb-first)

[polite equivalent for comparison] あの人を見ましたか？ → 見た？あの人？ "Did you see that person?"

Dialogue

[casual / two friends, A and B, walking through a shopping street]

A: 見て見て。あれ。　[Look, look. That.] (→ 1.7 〜て as request)

B: 何？どれ？　[What? Which one?]

A: 開いてんじゃん、あの店。　[It's open, that shop.] (→ 5.1 〜てる → てん; → 6.4 じゃん)

B: あ、ほんとだ。入る？　[Oh, you're right. Shall we go in?]

A: 行こう。　[Let's go.] (→ 1.6 volitional)

Variations

倒置 + 感嘆 Formula: [感嘆述語] + [主題/対象] [casual / tasting food someone cooked] うまっ！これ！ "This is so good! This!" (exclamation fires first; topic appended)

倒置 + 否定 Formula: [V-ない] + [主題] [casual / searching through a bag] ない！鍵《かぎ》！ "It's gone! My keys!" (panic-driven inversion; negative predicate first)

Contrast with

2.3: は省略（主題連鎖） — in topic chains, the topic is contextually silent; in inversion, the topic surfaces but in the wrong position relative to textbook expectations

道 — Colloquial Japanese Patterns