Before you memorise a single conjugation, it pays to see how differently the Japanese verb is built from the English one. The Japanese verb ends its clause, it inflects for tense and polarity (positive/negative) but never for person or number, and it wears its politeness on its sleeve. There is no infinitival "to," no helper verb "do/does," and no separate "to be" propping up the tense. 食べる means "I eat," "you eat," "he eats," "we eat," and "they eat" — all the same word. Understanding these facts up front turns Japanese conjugation from a maze into a single, orderly ending-stack.
The verb comes last
Japanese is an SOV language: the subject and object are set up first, each tagged by a particle, and the verb lands at the very end of the clause. Everything before the verb is scaffolding; the verb is the payload.
私は毎日日本語を勉強する。
watashi wa mainichi nihongo o benkyō suru
I study Japanese every day.
犬が走る。
inu ga hashiru
The dog runs.
Because the particles (は marks the topic, を marks the object, が marks the subject) already show who does what, word order is far freer than in English — but one rule is firm: the verb closes the clause. The full logic of Japanese word order is on the subject–object–verb word order page.
No agreement: one form for every subject
This is the single most freeing fact for an English speaker. English changes the verb to match its subject — I eat but he eats, I am but they are. Japanese does none of this. The verb never shifts for who or how many.
私も彼らも寿司を食べる。
watashi mo karera mo sushi o taberu
Both I and they eat sushi.
Here 私 ("I," singular) and 彼ら ("they," plural) share the exact same 食べる. There is no third-person -s, no singular/plural split, no gendered form. Whatever the subject, the verb keeps its shape. Learners coming from Romance or Germanic languages habitually look for an agreement ending and are surprised there is nothing to add.
No "to," no "do/does"
Two English scaffolding words simply do not exist in Japanese:
- No infinitival "to." The plain form 食べる is both "eat" and "to eat." It is called the dictionary form, and it needs no particle to mean "to eat" — see the dictionary form page.
- No auxiliary "do/does." English builds negatives and questions with a dummy verb (I do not eat, Do you eat?). Japanese builds them inside the verb: negation is an ending (食べない "don't eat"), and a question is just a particle か tacked on the end (食べるか "do you eat?"). There is no helper to conjure.
今日はコーヒーを飲まない。
kyō wa kōhī o nomanai
I won't drink coffee today.
毎朝、パンを食べますか。
maiasa, pan o tabemasu ka
Do you eat bread every morning?
Tense lives on the verb itself
In English, tense often rides on a helper (is going, did go, has gone). In Japanese, the verb carries tense in its own ending. There are fundamentally two tenses — non-past (present/future) and past — and the verb simply changes shape between them. No auxiliary is borrowed; the copula です/だ is not needed to hold a verb's tense, because the verb already holds it.
彼は昨日来た。
kare wa kinō kita
He came yesterday.
来週、友達が東京に来る。
raishū, tomodachi ga tōkyō ni kuru
A friend is coming to Tokyo next week.
来る ("come," non-past) versus 来た ("came," past): the single verb carries the whole shift, with no "did" and no "to be." The same is true of polarity — 飲む ("drink") versus 飲まない ("not drink"). Tense and positive/negative are the two things a Japanese verb does inflect for.
Endings stack: agglutination
Japanese is an agglutinative language, which means grammatical pieces attach to the stem one after another, each in its own slot, like beads on a string. Politeness, negation, tense, causative, passive — each is a suffix, and they combine in a fixed order onto one root.
子供の頃、よく泣かされた。
kodomo no koro, yoku nakasareta
As a kid, I was often made to cry.
泣かされた unpacks as 泣く ("cry") + causative さ ("be made to") + passive れ ("undergo") + past た — four grammatical ideas fused onto one verb. English needs a whole phrase ("was made to cry") for what Japanese carries in a single word. You never conjugate these forms randomly; each slot has a rule, and the rule depends only on the verb's class, which is why identifying the class comes first.
明日は学校に行きません。
ashita wa gakkō ni ikimasen
I won't go to school tomorrow.
Plain vs polite: a register axis English lacks
Every Japanese verb has a plain form (食べる) and a polite form (食べます) that mean the same thing but signal a different social relationship. English has no grammatical equivalent — you change vocabulary or add "please," but the verb itself does not carry politeness. In Japanese, choosing 食べる versus 食べます is a live decision in every sentence: plain among close friends and family, polite with strangers, customers, and superiors.
家で食べる。
ie de taberu
I'll eat at home.
レストランで食べます。
resutoran de tabemasu
I'll eat at a restaurant.
Both are correct "I'll eat"; the second is simply politer. This plain/polite split runs through the entire verb system, and it is laid out on the plain vs polite page.
The three classes, previewed
Every rule above — how to make the polite form, the negative, the past, the te-form — depends on which of three classes a verb belongs to: godan (Group 1, e.g. 書く, 飲む), ichidan (Group 2, e.g. 食べる, 見る), and the two irregulars する ("do") and 来る ("come"). Identify the class, and every later form follows a fixed rule. The next page, the three verb classes, is the master key; the whole system is charted on the verb conjugation map.
Common Mistakes
1. Adding だ/です after a plain verb to "complete" it. A plain verb is already a full predicate — nothing goes after it.
❌ 私は毎日勉強するだ。
watashi wa mainichi benkyō suru da
Wrong — a plain verb needs no copula; drop だ.
✅ 私は毎日勉強する。
watashi wa mainichi benkyō suru
I study every day.
2. Building a negative with a "do"-word. Negation is an ending on the verb, not a separate auxiliary.
❌ 私はコーヒーをする飲まない。
watashi wa kōhī o suru nomanai
Wrong — no 'do' helper; negation is built in: 飲まない.
✅ 私はコーヒーを飲まない。
watashi wa kōhī o nomanai
I don't drink coffee.
3. Putting the verb before its object (English SVO order). The verb closes the clause.
❌ 私は食べる寿司を。
watashi wa taberu sushi o
Wrong — the verb goes last: 寿司を食べる.
✅ 私は寿司を食べる。
watashi wa sushi o taberu
I eat sushi.
4. Changing the verb to match a plural subject. There is no agreement; the form never changes for number.
❌ 彼らは食べるます。
karera wa taberumasu
Wrong — no plural verb; the polite form is 食べます, same as for a singular subject.
✅ 彼らは食べます。
karera wa tabemasu
They eat.
Key Takeaways
- The Japanese verb ends the clause (SOV) and is a complete predicate on its own — no copula needed to finish it.
- It inflects for tense (non-past / past) and polarity (positive / negative) but never for person or number: 食べる serves every subject.
- There is no "to" (the dictionary form is already "to eat") and no "do/does" (negatives and questions are built into the verb).
- Endings stack agglutinatively onto one stem (泣く → 泣かされた), and every stacking rule depends on the verb's class.
- A live plain/polite choice runs through every verb (食べる vs 食べます) — a register axis English has no grammar for.
Now practice Japanese
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Start learning Japanese→Related Topics
- The Three Verb ClassesN5 — Every Japanese verb belongs to one of three classes — godan (五段), ichidan (一段), or the two irregulars する and 来る — and the class decides how every later form is built, so identifying it first is the master key to all conjugation.
- Basic Word Order: Subject–Object–VerbN5 — Japanese is an SOV language — the verb always comes last and every complement precedes it — so 'I read a book' is literally 'I book read'; this end-weighted skeleton underlies every later syntax topic and forces English speakers to retrain the SVO reflex.
- The Dictionary (Plain Non-past) FormN5 — The dictionary form (辞書形) — 食べる, 書く, する — is both the citation form you look verbs up under and a live spoken plain-style 'I eat / I'll eat', and it's the base that countless later structures attach to.
- Plain vs Polite RegisterN5 — The register axis every Japanese sentence sits on — plain 食べる for intimates and writing versus polite 食べます for strangers and superiors — and why it is decided only at the sentence's final verb.
- The Verb Conjugation MapN4 — A single 4×2 grid — four tenses crossed with plain and polite register — that turns Japanese conjugation from a list into one expandable map.