In this guide
- Introduction
- An action comes after its nouns
- A description goes before its noun
- One noun can describe another
- A different ending makes a statement
- The topic can be the doer or the thing affected
- Put the setting before the action
- A different order can keep the same roles
- Leave out what the listener already knows
- Read a new combination, then write your own
- About the author
“Mina’s small book” takes a few words to say, but it still names just one thing. I like keeping that in mind when a Japanese sentence starts to look long. Some of the words may simply be telling me more about the same book, rather than introducing a whole new thing to keep track of.
To say that someone reads that book, we need to connect the book with a person and an action. That’s where sentence structure comes in: the way words are arranged and connected to make meaning. In Japanese, word order and the little words called particles help show these relationships.
We’ll start with a short sentence about reading and see how its pieces fit together. From there, we’ll look at what happens when a description joins a noun, or when the sentence tells us what something is like. My aim is to help you see what each word belongs with, so you can work out how a new combination makes sense.
An action comes after its nouns
ミナが本を読みます。
Mina reads a book.
読みます is the action, “reads.” It’s a verb. Before it, ミナが identifies the reader, and 本を identifies what she reads. Read the three pieces together: ミナが / 本を / 読みます.
The little words が and を are particles. They follow the word they mark. In this action pattern, が marks who does the action, while を marks what the action affects. The particle を is pronounced “o.”
| Piece | What it tells us |
|---|---|
| ミナが | who reads: Mina |
| 本を | what she reads: a book |
| 読みます | the action: reads |
ミナ and 本 are nouns: words that name people or things. The particles connect those nouns to the reading. That same arrangement works with another action. 手紙 means “letter,” and 書きます means “writes”:
ユウが手紙を書きます。
Yuu writes a letter.
ユウが is the writer, 手紙を is what Yuu writes, and 書きます comes after both. The words have changed, but their connections work the same way.
Follow the two markers
犬 means “dog,” 猫 means “cat,” and 見ます means “sees.” Use が for who sees and を for what is seen.
犬が猫を見ます。
A description goes before its noun
Now let’s make one of those noun groups bigger. 猫 means “cat,” and 小さい means “small.” To name a small cat, put 小さい before 猫: 小さい猫. A word such as 小さい that describes a noun is an adjective.
ミナが小さい猫を見ます。
Mina sees a small cat.
The thing Mina sees is the whole 小さい猫, so を follows that whole group: ミナが / 小さい猫を / 見ます. 小さい belongs with the cat; it doesn’t describe how Mina sees.
A noun together with its descriptions is called a noun phrase. This is the useful boundary to notice: descriptions inside the phrase, then a particle after it. Making the phrase longer hasn’t created another object for the action.
Where does the object group end?
小さい means “small.” Choose the whole thing marked with を.
ミナが小さい猫を見ます。
小さい is an い-adjective. It keeps its final い before the noun: 小さい猫. The other common adjective pattern uses な as a link. 静か, “quiet,” is a な-adjective, so “a quiet room” is 静かな部屋. 部屋 means “room.”
静かな部屋
a quiet room
The な joins 静か to the following noun. When I see な here, I’m expecting the noun it describes next: 部屋.
Connect “quiet” to “room”
Make “a quiet room.” 静か is a な-adjective, and 部屋 means “room.” Type the one missing kana.
静か＿部屋
One noun can describe another
For “Mina’s book,” put ミナの before 本: ミナの本. の links the two nouns. The last noun tells you what the group names—a book—and the part before it tells you which book.
The relationship can be more than ownership. 学校 means “school,” and 先生 means “teacher.” Compare the same two nouns in opposite orders:
学校の先生
a teacher at the school
先生の学校
the teacher’s school
学校の先生 names a teacher and relates that teacher to a school. 先生の学校 names a school and relates it to the teacher. Reversing the nouns changes which thing you’re describing. の expresses their relationship; it doesn’t always mean that one owns the other.
You can now put an owner and an adjective in the same phrase. ミナの小さい本 means “Mina’s small book.” Both ミナの and 小さい describe 本. To make the whole book phrase the thing Yuu reads, put を after 本:
ユウがミナの小さい本を読みます。
Yuu reads Mina’s small book.
The three main pieces are still ユウが / ミナの小さい本を / 読みます. This is where a longer sentence starts to feel more manageable to me: several words can belong inside one familiar book phrase, with one を at its edge.
A different ending makes a statement
静かな部屋 names a quiet room. To say that the room is quiet, we need to make a statement about it. Start with 部屋は: “As for the room…” は is pronounced “wa” here and marks the topic—what we’re talking about.
部屋は静かです。
The room is quiet.
静か now finishes the description of the room instead of leading into a following noun. It takes です in this polite statement. The noun-linking な is gone because it isn’t joining the adjective to a noun here.
| Naming a room | Making a statement about it |
|---|---|
| 静かな部屋 — a quiet room | 部屋は静かです。 — The room is quiet. |
An い-adjective can do the same job, but it keeps its い. With 小さい, the polite statement ends 小さいです:
部屋は小さいです。
The room is small.
So 小さい部屋 names a small room, while 部屋は小さいです tells us that the room is small. The adjective’s job changes—from describing a noun to completing a statement—but the final い stays.
A noun can also finish a statement. We already know 先生, “teacher.” Put です after it to say what Mina is:
ミナは先生です。
Mina is a teacher.
Here, ミナは introduces Mina as the topic, and 先生です tells us what she is. The noun and です come at the end together. We don’t put a separate word in the English position of “is.”
Naming a room or saying something about it?
Select both complete polite statements about the room. Leave the groups that only name a kind of room unselected.
Which two tell us what the room is like?
The finishing part of a statement is called its predicate. You’ve now seen a verb doing that job, an adjective doing it, and a noun with です doing it. In each case, the predicate follows the other main pieces:
| What the statement says | The ending we used |
|---|---|
| an action | 読みます — reads |
| what someone is | 先生です — is a teacher |
| what something is like: い-adjective | 小さいです — is small |
| what something is like: な-adjective | 静かです — is quiet |
読みます is already the complete polite verb form here; don’t add です after it. These action forms can describe a habit or a plan, so 読みます can mean “reads” or “will read.” Context supplies the time; the placement works the same way.
The topic can be the doer or the thing affected
Earlier, 部屋は introduced a statement about the room. A person doing an action can be the topic too. Compare two ways to talk about Mina reading a book.
If someone asks who will read the book, you can identify the reader with が:
ミナが本を読みます。
Mina will read the book.
If you’ve chosen Mina as the person to talk about and you’re explaining her plans, は makes her the topic:
ミナは本を読みます。
As for Mina, she’ll read the book.
Mina is still the reader, and 本を is still what she’ll read. Here は takes the place of が and frames the rest as information about Mina. That’s how ミナは is used in the action examples that follow.
が can also give a straightforward report of an event without singling the actor out. These are useful starting contexts; which version fits depends on what the sentence is doing in the conversation. The guide to wa and ga compares the particles in paired conversations, so you can see how context changes the choice.
The topic can also be what the action affects. Imagine we’re sharing out some writing, and the letter is under discussion. We want to say who will write it:
手紙はユウが書きます。
As for the letter, Yuu will write it.
手紙は makes the letter the topic. ユウが still identifies the writer, so the topic isn’t the one doing the action here. It’s the thing Yuu will write.
Compare ユウが手紙を書きます, “Yuu writes a letter,” from the beginning. In the letter-topic version, は takes the place of を; we don’t write 手紙をは. This is a choice about what the statement is about, while が still marks who does the writing.
Does the topic do the writing?
The letter is under discussion, and we’re deciding who will write it. Choose the explanation of the sentence.
手紙はユウが書きます。
Put the setting before the action
A place can join the sentence as another marked group before the ending. For the place where an activity happens, use で. With the quiet-room phrase we already know, that gives 静かな部屋で:
ミナは静かな部屋で本を読みます。
Mina reads a book in a quiet room.
The pieces are ミナは / 静かな部屋で / 本を / 読みます. Inside the place phrase, 静かな still describes 部屋. After that whole phrase, で connects the room to the activity as its setting.
Going to a place is a different relationship. 行きます means “goes,” and に marks the destination in this pattern:
ミナは学校に行きます。
Mina goes to school.
Reading in a room and going to a school give their places different jobs. That’s why the choice between で and に comes from the relationship to the action, rather than a fixed English translation such as “at” or “in.”
Mark the whole place phrase
Mina is already in the quiet room, and that is where she reads. Type the particle for the place where this activity happens.
ミナは静かな部屋＿本を読みます。
We can also describe the action itself. ゆっくり means “slowly.” It’s an adverb: it can tell us how something happens. Put it before the action without adding a noun marker:
ミナは本をゆっくり読みます。
Mina reads the book slowly.
小さい本 describes the book as small. ゆっくり読みます describes the reading as slow. One description belongs inside a noun phrase; the other belongs with the action. The guide to Japanese adverbs shows how to turn an adjective into a description of an action.
Those two kinds of description can appear in the same sentence:
ミナは静かな部屋でユウの本をゆっくり読みます。
Mina slowly reads Yuu’s book in a quiet room.
Read the groups: ミナは / 静かな部屋で / ユウの本を / ゆっくり / 読みます. The room has a description, the book has an owner, and the reading has a manner. Each belongs to a different part of the sentence.
A different order can keep the same roles
Once you can see the whole groups, you can also see which changes leave their jobs intact. Compare these two orders:
ミナが小さい猫を見ます。
Mina sees a small cat.
小さい猫をミナが見ます。
Mina sees a small cat.
小さい猫を has moved as a whole. ミナが still identifies the one seeing, and 小さい猫を still identifies what she sees. The first written noun isn’t automatically the one doing the action; its particle shows that connection.
The order can affect emphasis and how a sentence fits the conversation. These two orders preserve the basic roles, but that doesn’t make every order equally natural everywhere. The first is a useful ordinary model for our examples.
Changing a particle is different from moving a group. 小さい猫がミナを見ます means “The small cat sees Mina.” The adjective still describes the cat, but が now makes that cat the one seeing, while ミナを makes Mina the one seen.
Move a group or change its job?
Select both sentences that say Mina sees a small cat. Keep the same person seeing and the same animal being seen.
Choose all the matching sentences.
Keep the words inside each group together too. 小さい猫 is a small cat. If you move 小さい to describe 部屋 instead, you’ve changed which thing is small; you haven’t merely rearranged the same pieces.
Leave out what the listener already knows
Suppose we’re already talking about Mina, and someone asks what she’ll read. We can answer without naming her again:
本を読みます。
She’ll read a book. (We’re talking about Mina.)
If Mina and the book are both already understood, 読みます can be enough: “She’ll read it.” The verb hasn’t acquired hidden words for “she” and “it.” The conversation supplies those participants. Without that context, the short answer wouldn’t identify them.
The familiar order “who acts / what the action affects / action” is a common pattern rather than three compulsory slots. The action follows the groups that are stated; an understood person or thing can stay unsaid. And as you’ve seen, the ending can also describe something or say what it is.
Read a new combination, then write your own
長い means “long” and is an い-adjective. You already know 手紙, “letter,” so 長い手紙 is “a long letter.” Try following the groups in this new combination.
Follow the descriptions and the markers
ユウ is Yuu, 手紙 means “letter,” 長い means “long” (an い-adjective), and 書きます means “writes.” Choose the explanation of this sentence.
ユウが静かな部屋で長い手紙を書きます。
There are two checks I find useful here. Inside a noun phrase, look for the noun that the description belongs to. Then look outside it: the particle after the whole phrase shows how that thing connects to the statement. Those two views let you explain the sentence, rather than recognise only a familiar string of words.
Build a sentence, then change the adjective’s job
Use ユウ (Yuu), 新しい (new, an い-adjective), 本 (book), 読みます (reads) and 家 (home). Write “Yuu reads a new book at home.” Then write “The book is new” as a separate polite statement. Identify the ending in each sentence and explain why 新しい belongs in a different place. You may choose the order of the marked groups before the verb.
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In the first sentence, 新しい belongs before 本, inside the object phrase marked with を. In the second, it finishes the statement as 新しいです, after the topic 本は. The final い stays in both jobs. For “at home,” use 家で, the place where reading happens.
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A Japanese sentence can grow without losing those boundaries: descriptions before their noun, a particle after the whole noun phrase, and a predicate after the other main pieces. Knowing which words belong together is what makes the order useful.
About the author
B. Rungswell
B. Rungswell is the editor of the Bunpo Check blog and a native English speaker who has passed JLPT N1. Drawing on many years of life in Japan and experience working at Japanese companies, Rungswell writes practical guides to Japanese grammar for English-speaking learners.