# Japanese Grammar Cheatsheet: From First Principles

You already know kanji. You can read [水](/kanjis/6c34) and [食](/kanjis/98df) and [行](/kanjis/884c). But you open a Japanese sentence and the kanji are separated by squiggly hiragana that rearrange the meaning in ways English never prepared you for.

This post is the grammar cheatsheet I wish existed when I started: every major structural feature of Japanese, stated once, precisely, with one or two examples. No filler. If you want the deep dive, I point you to the book. Here I give you the map.

The design principle: **Japanese grammar is postpositional, agglutinative, and topic-prominent.** Every rule below is a consequence of those three properties.

---

## 1. Word Order: SOV and Head-Final

English is SVO (Subject-Verb-Object). Japanese is SOV (Subject-Object-Verb). More precisely, Japanese is **head-final**: the head of every phrase comes last.

| Structure | English (head-initial) | Japanese (head-final) |
|-----------|----------------------|---------------------|
| Clause | I **eat** sushi | 私は寿司を **食べる** |
| Noun phrase | **big** dog | 大きい **犬** |
| Adposition | **in** Tokyo | 東京 **で** |
| Relative clause | the man **who** came | 来た **人** |
| Subordinate | **because** it rained | 雨が降った **から** |

This single principle -- head-final -- explains why particles come after nouns, why verbs end sentences, why relative clauses precede their head noun, and why subordinate clauses precede main clauses. One rule, five consequences.

![Syntax tree showing Japanese is head-final in both CP and TP, with the complementizer and tense-marking verb appearing rightmost in their phrases](https://upload.wikimedia.org/wikipedia/commons/2/2c/CP_TP_Head_Final_Japanese.png)
*Phrase-structure tree illustrating that Japanese is head-final in both CP (complementizer phrase) and TP (tense phrase) — heads sit on the right, exactly where English puts them on the left. Source: [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:CP_TP_Head_Final_Japanese.png).*

> **Book**: Shibatani, M. (1990). *The Languages of Japan*. Cambridge University Press. Chapter 11 is the definitive typological analysis.

---

## 2. Particles (助詞): The Skeleton of the Sentence

Particles are postpositions that mark the grammatical role of each noun phrase. English uses word order; Japanese uses particles. This means **word order is flexible** -- you can scramble noun phrases freely as long as the verb stays last.

### Core Case Particles

| Particle | Function | Example | Translation |
|:--------:|----------|---------|-------------|
| **は** (wa) | Topic marker | 猫 **は** 魚を食べる | (As for) the cat, it eats fish |
| **が** (ga) | Subject marker | 猫 **が** いる | There is a cat / A cat exists |
| **を** (wo) | Direct object | 水 **を** 飲む | Drink water |
| **に** (ni) | Target / location / time | 東京 **に** 行く | Go to Tokyo |
| **で** (de) | Means / location of action | 箸 **で** 食べる | Eat with chopsticks |
| **の** (no) | Possession / noun modification | 猫 **の** 名前 | The cat's name |
| **と** (to) | And / with / quotation | 犬 **と** 猫 | Dog and cat |
| **から** (kara) | From (space/time) | 東京 **から** 来た | Came from Tokyo |
| **まで** (made) | Until / as far as | 駅 **まで** 歩く | Walk as far as the station |
| **へ** (e) | Direction (toward) | 北 **へ** 行く | Go toward the north |
| **も** (mo) | Also / too | 猫 **も** 来た | The cat came too |
| **より** (yori) | Comparison (than) | 犬 **より** 大きい | Bigger than a dog |

### The は vs が Distinction

This is the single most written-about topic in Japanese linguistics. The short version:

- **は** marks what the sentence is *about* (old information, the topic)
- **が** marks what *does the action* or *exists* (new information, the subject)

```
A: 誰が来た？         → Who came?         (が marks unknown/new info)
B: 田中さんが来た。   → Tanaka came.       (が introduces new info)

A: 田中さんは？       → What about Tanaka? (は marks known topic)
B: 田中さんはもう帰った。→ Tanaka already left. (は = "as for Tanaka...")
```

**The exhaustive-listing が**: 私 **が** 学生です = "*I* am the student (not someone else)." Contrast: 私 **は** 学生です = "As for me, I'm a student."

![Syntactic tree of the Japanese SOV sentence "John-ga ringo-o tabe-ta" (John ate an apple), with the subject particle ga and object particle o marking case roles](https://upload.wikimedia.org/wikipedia/commons/f/ff/The_structure_of_%22John-ga_ringo-o_tabe-ta%22.png)
*Parse tree for ジョンがリンゴを食べた ("John ate an apple"). The particles -ga (subject) and -o (object) attach to their nouns; the verb sits at the bottom-right of the tree — case is carried by the particles, not by word order. Source: [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:The_structure_of_%22John-ga_ringo-o_tabe-ta%22.png).*

> **Book**: Kuno, S. (1973). *The Structure of the Japanese Language*. MIT Press. Pages 37-71 are still the best treatment of は vs が after 50 years.

---

## 3. Verb Conjugation: The Agglutinative Engine

Japanese verbs don't inflect for person or number. Instead, they agglutinate suffixes to a stem to encode tense, negation, politeness, mood, causation, passivity, and desire -- in that order. One verb can carry six suffixes.

### The Three Verb Groups

| Group | Pattern | Dictionary form | ます-stem | Example |
|:-----:|---------|:--------------:|:---------:|---------|
| **I** (五段 godan) | Consonant stem | 書**く** (kaku) | 書**き** | Write |
| **II** (一段 ichidan) | Vowel stem | 食べ**る** (taberu) | 食べ | Eat |
| **III** (irregular) | Only two verbs | する / 来る | し / 来 (ki) | Do / Come |

### Essential Conjugation Table (Group I: 書く)

| Form | Conjugation | Usage |
|------|-------------|-------|
| Dictionary | 書く | Plain present/future |
| ます (polite) | 書きます | Polite present/future |
| ない (negative) | 書かない | Plain negative |
| た (past) | 書いた | Plain past |
| て (connective) | 書いて | "and" / request / progressive |
| ば (conditional) | 書けば | If (one writes) |
| たら (conditional) | 書いたら | If/when (one wrote) |
| 可能 (potential) | 書ける | Can write |
| 受身 (passive) | 書かれる | Is written |
| 使役 (causative) | 書かせる | Make/let (someone) write |
| 意向 (volitional) | 書こう | Let's write / I'll write |
| 命令 (imperative) | 書け | Write! |

### The て-form: Swiss Army Knife

The て-form is the most productive conjugation in Japanese. It connects to auxiliaries to build compound constructions:

| Construction | Meaning | Example |
|-------------|---------|---------|
| ～ている | Progressive / state | 食べ **ている** = is eating |
| ～てある | Resultant state | 窓が開け **てある** = window has been opened |
| ～てしまう | Completion / regret | 食べ **てしまった** = ate it all (oops) |
| ～てみる | Try doing | 食べ **てみる** = try eating |
| ～てくれる | Someone does for me | 教え **てくれた** = taught me (grateful) |
| ～てあげる | I do for someone | 教え **てあげる** = I'll teach (for you) |
| ～てもらう | I receive the action | 教え **てもらった** = got someone to teach me |
| ～てもいい | Permission | 食べ **てもいい** = may eat |
| ～てはいけない | Prohibition | 食べ **てはいけない** = must not eat |

> **Book**: Makino, S. & Tsutsui, M. (1986). *A Dictionary of Basic Japanese Grammar*. The Japan Times. The gold standard. 「ている」alone gets 8 pages.

---

## 4. Adjectives: Two Distinct Systems

Japanese has two adjective classes with fundamentally different morphology.

| Property | い-adjectives (形容詞) | な-adjectives (形容動詞) |
|----------|:-------------------:|:--------------------:|
| Ending | ～い | ～な (before nouns) |
| Conjugates? | Yes (like verbs) | No (uses だ/です) |
| Negative | 高く**ない** | 静かで**はない** |
| Past | 高**かった** | 静か**だった** |
| Adverbial | 高**く** | 静か**に** |
| Example | 高い (takai) = expensive | 静か (shizuka) = quiet |

```
い-adjective:  高い本        → expensive book
              本は高い       → the book is expensive
              高くない       → not expensive
              高かった       → was expensive

な-adjective:  静かな夜      → quiet night
              夜は静かだ     → the night is quiet
              静かではない    → not quiet
              静かだった      → was quiet
```

**Trap**: いい (good) is irregular. Its conjugation uses the older form よい: よくない, よかった, よく.

---

## 5. Politeness: The Vertical Axis

Japanese grammaticalizes social hierarchy. This is not "formal vs informal" -- it is a multi-layered system encoding your relationship to the listener and the referent.

### Three Registers

| Register | Verb (eat) | When |
|----------|-----------|------|
| Plain (普通形) | 食べる | Friends, family, inner group |
| Polite (丁寧語) | 食べます | Default with strangers, colleagues |
| Humble/Honorific (敬語) | いただく / 召し上がる | Business, elders, customers |

### 敬語 (Keigo): The Three Branches

| Type | Purpose | Example (eat) |
|------|---------|--------------|
| 尊敬語 (sonkeigo) | Elevate the other's actions | 召し上がる |
| 謙譲語 (kenjougo) | Lower your own actions | いただく |
| 丁寧語 (teineigo) | General politeness | 食べます |

```
Plain:     田中が食べた。           Tanaka ate.
Polite:    田中さんが食べました。     Tanaka ate. (polite)
Honorific: 田中様が召し上がりました。  Tanaka (honored) ate. (elevating)
Humble:    私がいただきました。       I (humbly) ate. (lowering self)
```

> **Book**: Wetzel, P.J. (2004). *Keigo in Modern Japan*. University of Hawaii Press. The sociolinguistic analysis, not just the grammar tables.

---

## 6. Sentence-Final Particles: Emotional Markup

These particles at the end of sentences encode the speaker's attitude. They have no English equivalent -- they are **pragmatic**, not semantic.

| Particle | Function | Example |
|:--------:|----------|---------|
| **よ** | Assertion / informing | 危ないよ！ = It's dangerous! (I'm telling you) |
| **ね** | Seeking agreement | いい天気ですね = Nice weather, isn't it |
| **な** | Emotional / self-reflection | きれいだな = How beautiful... (to myself) |
| **か** | Question | 行くか？ = Going? |
| **の** | Explanation / seeking | どうしたの？ = What happened? (explain) |
| **わ** | Soft assertion | 行くわ = I'm going (gentle) |
| **ぞ** | Strong assertion (masc.) | 行くぞ！ = Let's go! (forceful) |
| **かな** | I wonder... | 大丈夫かな = I wonder if it's okay |
| **よね** | Confirmation seeking | 明日だよね？ = It's tomorrow, right? |

---

## 7. Counters (助数詞): The Classifier System

Japanese requires classifiers (counters) between numbers and nouns. There is no bare "three dogs" -- you must say 三**匹**の犬 (san-**biki** no inu), where 匹 classifies small animals.

### Essential Counters

| Counter | For | 1 | 2 | 3 |
|:-------:|-----|:-:|:-:|:-:|
| つ | General | ひとつ | ふたつ | みっつ |
| 人 (にん) | People | ひとり | ふたり | さんにん |
| 匹 (ひき) | Small animals | いっぴき | にひき | さんびき |
| 本 (ほん) | Long/thin things | いっぽん | にほん | さんぼん |
| 枚 (まい) | Flat things | いちまい | にまい | さんまい |
| 台 (だい) | Machines/vehicles | いちだい | にだい | さんだい |
| 冊 (さつ) | Books | いっさつ | にさつ | さんさつ |
| 杯 (はい) | Cups/glasses | いっぱい | にはい | さんばい |
| 回 (かい) | Times/occasions | いっかい | にかい | さんかい |
| 階 (かい) | Floors | いっかい | にかい | さんかい |

Note the **sound changes** (連濁 and 促音): いっ**ぽ**ん, さん**び**き, いっ**さ**つ. These are regular phonological processes, not arbitrary irregularities.

> **Paper**: Downing, P. (1996). *Numeral Classifier Systems: The Case of Japanese*. John Benjamins. The only full monograph on the system.

---

## 8. Giving and Receiving: The Directional Triad

Japanese lexicalizes the direction of benefit-transfer. English uses one verb "give"; Japanese uses three, depending on social direction.

```
┌─────────────────────────────────────────────┐
│                                             │
│   INGROUP (me)  ←──── くれる ──── OUTGROUP  │
│                                             │
│   INGROUP (me)  ───── あげる ────→ OUTGROUP  │
│                                             │
│   INGROUP (me)  ←──── もらう ──── OUTGROUP  │
│        (I receive from)                     │
│                                             │
└─────────────────────────────────────────────┘
```

| Verb | Direction | Example |
|------|-----------|---------|
| あげる | I/we → others | 友達に本を **あげた** = I gave a book to my friend |
| くれる | Others → me/us | 友達が本を **くれた** = My friend gave me a book |
| もらう | I/we ← others (receive) | 友達に本を **もらった** = I received a book from my friend |

These compound with て-form to express favor:

- 教えて **あげる** = I'll teach (for your benefit)
- 教えて **くれる** = (Someone) teaches me (grateful)
- 教えて **もらう** = I get (someone) to teach me

This is not just word -- it is grammar. Choosing the wrong verb implies the wrong social relationship.

---

## 9. Passive, Causative, and Causative-Passive

Japanese stacks these morphemes. The suffering passive is unique to Japanese among major languages.

| Form | Suffix | Example (read: 読む) | Meaning |
|------|--------|---------------------|---------|
| Active | -- | 読む | I read |
| Passive | -(r)areru | 読まれる | Is read / I suffer someone reading |
| Causative | -(s)aseru | 読ませる | Make/let someone read |
| Causative-passive | -(s)aserareru | 読まされる | Be made to read (against my will) |

**The suffering passive** (迷惑の受身): unique to Japanese, marks the subject as adversely affected by someone else's action.

```
雨に降られた。
Rain-by fall-PASSIVE-PAST
"I got rained on." (and I suffered from it)

隣の人にタバコを吸われた。
Neighbor-by cigarette-ACC smoke-PASSIVE-PAST
"The person next to me smoked." (and I suffered from it)
```

> **Book**: Shibatani, M. (1985). "Passives and related constructions" in *Language* 61(4). The foundational analysis of the Japanese passive.

---

## 10. Conditionals: Four Ways to Say "If"

Each conditional has a distinct semantic profile. They are not interchangeable.

| Form | Nuance | Example |
|------|--------|---------|
| ～ば | General / hypothetical | 読め**ば**わかる = If you read it, you'll understand |
| ～たら | When/if (temporal, completed) | 読ん**だら**教えて = When you've read it, tell me |
| ～と | Automatic consequence | ボタンを押す**と**ドアが開く = Push the button and the door opens |
| ～なら | If (what you just said is true) | 行く**なら**傘を持って = If you're going, take an umbrella |

**Decision tree:**

```
Is the consequence automatic/habitual?
  YES → ～と  (押すとドアが開く)
  NO ↓
Are you responding to what someone said?
  YES → ～なら (行くなら...)
  NO ↓
Is the condition about a completed event?
  YES → ～たら (着いたら電話して)
  NO → ～ば   (安ければ買う)
```

> **Paper**: Masuoka, T. (1993). 「条件表現」in *日本語の条件表現*. Kurosio. The definitive typology of Japanese conditionals.

---

## 11. Relative Clauses: No Pronoun, Just Stack

Japanese relative clauses precede the noun and use **no relative pronoun**. The gap is implicit.

```
English:  The book [that I bought yesterday]
Japanese: [昨日買った] 本
         [yesterday bought] book

English:  The person [who gave me this]
Japanese: [これをくれた] 人
         [this gave-me] person
```

This means Japanese can stack relative clauses with zero explicit marking:

```
[去年東京で会った] [フランス語を話す] 人
[Last year Tokyo-in met] [French speaks] person
= The person who speaks French whom I met in Tokyo last year
```

The head-final principle again: everything modifies what comes after it.

---

## 12. Nominalizers: Turning Clauses into Nouns

Two nominalizers convert entire clauses into noun phrases:

| Nominalizer | Usage | Example |
|:-----------:|-------|---------|
| **の** | Casual, concrete, sensory | 走る **の** が好き = I like running |
| **こと** | Formal, abstract, factual | 走る **こと** が大切だ = Running is important |

Rules of thumb:
- Perception verbs (見る, 聞く, 感じる) prefer **の**: 鳥が飛ぶ **の** を見た (saw birds flying)
- Abstract statements prefer **こと**: 日本語を話す **こと** ができる (can speak Japanese)

---

## 13. Conjunctions and Clause-Chaining

Japanese chains clauses by conjugating earlier verbs, not by adding conjunctions. The て-form is the primary chaining mechanism.

| Method | Usage | Example |
|--------|-------|---------|
| て-form | Sequential / and | 起き**て**、食べ**て**、出かけた = Woke up, ate, and left |
| し | Listing reasons | 安い**し**、おいしい**し** = It's cheap, and it's tasty (among other things) |
| けど / が | But / although | 高い**けど**おいしい = It's expensive but tasty |
| ので | Because (objective) | 雨な**ので**行かない = Because it's raining, I won't go |
| から | Because (subjective) | 嫌い**だから**食べない = Because I dislike it, I won't eat it |
| のに | Despite / although | 勉強した**のに**落ちた = Despite studying, I failed |
| ながら | While (simultaneous) | 歩き**ながら**話す = Talk while walking |

---

## 14. Evidentiality and Hearsay

Japanese grammaticalizes information source -- how you know what you're asserting.

| Form | Meaning | Example |
|------|---------|---------|
| ～そうだ (appearance) | Looks like | 雨が降り**そうだ** = It looks like it'll rain |
| ～そうだ (hearsay) | I heard that | 雨が降る**そうだ** = I heard it'll rain |
| ～ようだ | It seems (inference) | 雨が降った**ようだ** = It seems it rained |
| ～らしい | Apparently (evidence-based) | 雨が降る**らしい** = Apparently it'll rain |
| ～みたいだ | It's like / seems (casual) | 雨**みたいだ** = Seems like rain |
| ～だろう | Probably | 雨が降る**だろう** = It'll probably rain |

Note: ～そうだ (appearance) attaches to the verb **stem** (降り**そう**), while ～そうだ (hearsay) attaches to the **dictionary form** (降る**そう**). Same word, different attachment, different meaning.

---

## 15. Sentence Structure Summary

Putting it all together, the Japanese sentence template is:

```
[Topic は] [Subject が] [Indirect Object に] [Direct Object を] [Adverb] [Verb-conjugation + auxiliaries] [Sentence-final particle]
```

Example:

```
田中さんは   昨日    友達に     本を     静かに    読んであげたらしいよ。

田中さんは → Topic: "As for Tanaka"
昨日      → Time: "yesterday"
友達に    → Indirect object: "to a friend"
本を      → Direct object: "a book"
静かに    → Adverb: "quietly"
読んで    → て-form of 読む: "read and..."
あげた    → giving (outward): "did for (the friend)"
らしい    → evidential: "apparently"
よ        → assertion particle: "I'm telling you"

= "Apparently Tanaka read a book to a friend quietly yesterday."
```

Seven pieces of grammatical information packed into one sentence-final verb complex. That is the agglutinative engine at work.

---

## The Map

| # | Feature | Key insight |
|:-:|---------|------------|
| 1 | SOV word order | Head-final: everything modifies what follows |
| 2 | Particles | Replace word order; enable scrambling |
| 3 | Verb conjugation | Agglutinative suffixes, not person/number inflection |
| 4 | Two adjective types | い conjugates like verbs; な uses copula |
| 5 | Politeness | Grammaticalized social hierarchy, three registers |
| 6 | Sentence-final particles | Pragmatic (attitude), not semantic (meaning) |
| 7 | Counters | Obligatory classifiers with phonological changes |
| 8 | Giving/receiving | Three verbs encoding social direction of benefit |
| 9 | Passive/causative | Stackable; suffering passive is unique |
| 10 | Four conditionals | ば/たら/と/なら — distinct semantic profiles |
| 11 | Relative clauses | Prenominal, no relative pronoun, just gap |
| 12 | Nominalizers | の (concrete) vs こと (abstract) |
| 13 | Clause-chaining | て-form chains; conjunctions are clause-final |
| 14 | Evidentiality | Grammaticalized information source |
| 15 | Sentence template | Topic-Comment with verb-final agglutination |

---

If the kanji in these examples are unfamiliar, the [kanji dictionary](/kanjis) and the per-grade [study decks](/lessons) cover everything appearing above.

## Essential References

- Kuno, S. (1973). *The Structure of the Japanese Language*. MIT Press. -- The foundational generative analysis. は vs が treatment is still unmatched.
- Shibatani, M. (1990). *The Languages of Japan*. Cambridge University Press. -- Best typological overview. Treats Japanese as a language, not a curiosity.
- Makino, S. & Tsutsui, M. (1986, 1995, 2008). *A Dictionary of Basic / Intermediate / Advanced Japanese Grammar*. The Japan Times. -- The trilogy. Every serious learner owns these.
- Hasegawa, Y. (2015). *Japanese: A Linguistic Introduction*. Cambridge University Press. -- Modern, comprehensive, accessible.
- Martin, S.E. (1975). *A Reference Grammar of Japanese*. Yale University Press. -- 1,198 pages. The completionist's grammar.
- Tsujimura, N. (2013). *An Introduction to Japanese Linguistics*. Wiley-Blackwell. 3rd ed. -- Best textbook for linguistics students.
- Iwasaki, S. (2013). *Japanese: Revised Edition*. John Benjamins. -- Corpus-driven functional grammar. How Japanese actually works in use.