moji. Get the app

Published August 13, 2026. Updated September 6, 2026

Japanese particles explained: は, が, を and the rest

A Japanese particle is a short word that follows a noun or a clause and labels the role it plays in the sentence. は (read わ) marks the topic, the thing the sentence is about. が marks the subject, the thing doing or being. を (read お) marks the direct object, the thing a verb acts on. Because the label travels attached to the word, Japanese does not need a fixed word order to keep roles straight, which is the opposite of how English works.

That is the whole idea in three sentences, and it is also why particles are hard: their meanings are jobs, not pictures. Moji - Learn Japanese Daily for iPhone teaches them as vocabulary cards rather than a grammar chapter, with each card carrying an example sentence chosen so the particle is the only unfamiliar thing on screen. This page walks the core set the same way, one particle and one sentence at a time.

What is a Japanese particle?

Particles (助詞, じょし, joshi) are postpositions. They come after the word they mark, not before it, so where English says “to Japan”, Japanese says 日本へ (にほんへ), Japan first and the marker second. They attach to nouns, verbs, adjectives and whole sentences.

The consequence is worth sitting with. In English, “the dog bit the man” and “the man bit the dog” mean different things because position carries the roles. In Japanese the roles are stamped on the words, so the parts can move without changing who did what. Word order still matters for emphasis and for the verb, which stays at the end, and that is its own subject: why word order matters in Japanese.

Three particles are read differently from their kana, a leftover of older spelling: は is read わ, を is read お, and へ is read え. Everywhere else those characters are ha, wo and he. This trips up nearly every beginner in the first month, so it is worth learning as a fact rather than discovering by accident.

は vs が: what is the actual difference?

This is the question, and the honest answer is that it takes a long time. But the first ninety percent is learnable quickly, and two nearly identical sentences show it better than a rule does.

夢はあります (ゆめはあります) means “I have a dream.” 水があります (みずがあります) means “There is water.” Same verb, ある (to exist), different particle, different job.

In 夢はあります, は sets up 夢 (ゆめ, dream) as the frame: as for dreams, there are some. The sentence is about dreams, and the existence is the news. In 水があります, が points at 水 (みず, water) as the subject that exists, and the water itself is the news. That is the workhorse distinction: が tends to introduce or single out, は tends to take something already in play and say something about it.

Two rules of thumb that hold up:

Now the honesty. は versus が is not a distinction you finish. It bleeds into emphasis, politeness, discourse structure and what the listener already knows, and experienced speakers describe it as intuition rather than rule-following (Tofugu’s guide, cited below, says as much). Expect to get it approximately right early and keep refining for years. That is normal, and it is not a reason to delay the rest of the language.

When が is not optional

One rule is genuinely mechanical, which makes it a good anchor while the rest is still fuzzy: は does not appear inside a relative clause. When a clause modifies a noun, its subject is marked with が, or sometimes with の, never with は.

The reason is structural rather than arbitrary. は frames a whole sentence, and a relative clause is not a sentence, it is a modifier hanging off a noun. There is nothing there to frame, only a subject to mark, and that is が’s job.

This is useful early because it converts a fuzzy stylistic choice into a hard one in at least one place. If you can spot a modifying clause, you know which particle goes in it.

を marks the thing the verb acts on

水を飲みます (みずをのみます) means “I drink water.” 水 (みず, water) is the thing being drunk, so it takes を, and the verb 飲む (のむ, to drink) follows.

を is the most mechanical of the core particles and the easiest to internalise. If a verb acts on something, that something takes を. The one wrinkle is the reading: を is read お, and it exists in modern Japanese for essentially this one purpose.

に vs で: where something is, versus where something happens

These two both translate to “at” or “in” often enough to blur together, and a matched pair separates them cleanly.

猫は家にいます (ねこはいえにいます) means “The cat is at home.” 友達と家で遊びます (ともだちといえであそびます) means “I hang out with my friend at my house.”

Same word, 家 (いえ, house, home), two different particles. With に, the house is where the cat exists. With で, the house is the setting where an activity takes place. That is the split: に marks location of existence or destination, で marks the location of an action.

Both particles do more than location. に also handles time points and the indirect object, roughly “to, at, in, on”. で also covers means and instrument, roughly “at, in, by, with”. The second sentence sneaks in another one too: と, which means “and” between nouns and “with” for company, as in 友達と (ともだちと, with a friend).

私の猫 (わたしのねこ) means “my cat.” の sits between two nouns and makes the first one describe the second, covering possession, belonging, origin and category all at once.

It sits at rank one in the frequency data Moji’s order is derived from, ahead of every noun and verb in the language, which you can see at the top of the 100 most common Japanese words. It also does a second job later on, turning a whole clause into something a sentence can treat as a noun, but the two-noun use is the one to own first.

か turns a statement into a question

犬ですか (いぬですか) means “Is it a dog?” Add か to the end of a statement and it becomes a question. There is no word-order change and no auxiliary verb, which makes it one of the friendliest things in the language for an English speaker.

か also means “or” when it sits between nouns. Same character, related idea: it introduces uncertainty about which option applies.

も means “too”, and it replaces rather than stacks

私も (わたしも) means “Me too.” も means also, too, or even, and the important structural fact is that it takes the place of は, が or を rather than sitting next to them. You do not say 私はも. も steps in and does the marking itself.

That substitution behaviour is why も feels strange to learners who have just internalised that every noun needs a role marker. も is the role marker in that slot, plus the “also”.

Why particles are easier to learn as vocabulary

A particle card on its own is nearly information-free. “Topic marker” is not a meaning you can picture, so the sentence has to do the teaching, and that only works if you can already read the sentence.

That constraint drives where particles sit in Moji’s study order. They are the most frequent words in Japanese, nine of the ten most common entries, but they are not the first cards you see. の arrives around card 53, は around 63, が around 89, か around 109, を around 129, に around 183 and で around 189, each placed after the vocabulary its example needs. 水 and 飲む are both taught well before the を card that uses them, so when を appears, the sentence around it is already readable.

The same discipline applies to the example sentences themselves, which are written to a difficulty budget so that a card teaching one thing does not smuggle in four others: why example sentences are too hard. And the ordering logic behind all of it, including why raw frequency makes a bad first week, is covered in what order should you learn Japanese words in.

Moji is not a dictionary app. It is one curated path through 8,237 words, and particles are simply cards on that path, reviewed on the same schedule as everything else.

Try it

If seeing each particle inside a sentence you can already read sounds better than another は versus が explanation, that path is free to start in Moji: flashcards with example sentences and mnemonics cost nothing. Download Moji on the App Store

Sources