Japanese た-Form (Plain Past)

In Brief

The た-form is the plain affirmative past form of a Japanese verb: 食べる becomes 食べた (“ate”), and 読む becomes 読んだ (“read”). Its sound changes match the て-form: replace final て with た and で with だ. Use it for casual past statements, before nouns, and in patterns such as たことがある and たら.

Overview

The た-form (た形, ta-kei) tells you that an action or event is viewed as completed. It is the plain form, meaning the non-ます style used with friends and family, in diaries, in quoted thoughts, and inside many larger sentence patterns. For example, 昨日、映画を見た means “I watched a movie yesterday.” The polite equivalent is 昨日、映画を見ました.

This form is introduced around A2 because it builds directly on the て-form. If you can make 書いて, 読んで, and 話して, you already know nearly all the required sound changes: 書いた, 読んだ, and 話した follow the same pattern. English speakers should notice an important difference: Japanese does not add one universal past ending like English -ed. The final sound of a godan verb determines which past ending appears.

The た-form does more than finish a sentence. Japanese can put a whole clause directly before a noun (a word for a person, object, place, or idea): 買った本 is literally “bought book” and naturally means “the book I bought.” The same form is also the foundation of expressions for past experience, sequence, conditions, alternatives, and recent events.

How It Works

The beginner rule: copy the て-form sound change

If you know a verb’s て-form, the quickest method is:

• change て to た: 見て → 見た
• change で to だ: 読んで → 読んだ

This works because the て-form and た-form use the same stem and sound changes. However, do not simply attach た to every dictionary form: 読むた and 書くた are incorrect.

Ichidan verbs

An ichidan verb (a verb whose final る normally drops as one unit) is straightforward: remove る and add た.

Dictionary form	Remove	た-form	Meaning
食べる	る	食べた	ate
見る	る	見た	saw; watched
起きる	る	起きた	woke up; got up
開ける	る	開けた	opened

Many verbs ending in -いる or -える are ichidan, but not all. Common verbs such as 入る (“enter”), 走る (“run”), and 帰る (“return”) are godan verbs and follow the patterns below.

Godan verbs

A godan verb (a verb whose final kana changes across conjugations) has one of five sound-change groups. Learn these groups by the dictionary-form ending.

Dictionary ending	た-form ending	Example	た-form	Meaning
う, つ, る	った	買う	買った	bought
う, つ, る	った	待つ	待った	waited
う, つ, る	った	帰る	帰った	returned
む, ぶ, ぬ	んだ	読む	読んだ	read
む, ぶ, ぬ	んだ	遊ぶ	遊んだ	played
む, ぶ, ぬ	んだ	死ぬ	死んだ	died
く	いた	書く	書いた	wrote
ぐ	いだ	泳ぐ	泳いだ	swam
す	した	話す	話した	spoke

The small っ in 買った represents a brief pause before the following consonant. It is not optional: 買た is not the same form and is incorrect.

The important 行く exception

行く (“go”) looks as though it should become 行いた, but its actual た-form is 行った. Its て-form is likewise 行って. This is the main everyday exception to the godan table.

Irregular verbs

Japanese has two central irregular verbs:

Dictionary form	た-form	Meaning
する	した	did
来る（くる）	来た（きた）	came

Compounds follow する: 勉強する → 勉強した, 予約する → 予約した, and 運動する → 運動した.

Plain past versus polite past

The event time is the same; the difference is how the sentence is presented to the listener.

Style	Non-past	Past	Typical setting
Plain	食べる	食べた	casual conversation; embedded clauses
Polite	食べます	食べました	polite conversation

Plain does not automatically mean rude. It is required inside many grammatical structures even when the sentence as a whole is polite:

• 日本に行ったことがあります。 — I have been to Japan.
• ご飯を食べた後で、薬を飲みます。 — I take the medicine after eating.

The ending あります or 飲みます makes the whole sentence polite. Changing 行った to 行きました inside ことがある would not be standard grammar.

Plain past questions

In casual speech, a rising intonation can turn the た-form into a question:

• もう食べた？ — Have you eaten yet?
• 宿題、終わった？ — Have you finished your homework?

In writing, a question mark often shows this conversational intonation. A polite question uses ましたか: もう食べましたか.

Past negative forms

The plain past negative is also useful, but it is not made by adding た to the affirmative form. Start from the plain negative ending ない and change it to なかった:

Affirmative past	Negative past	Meaning
食べた	食べなかった	ate / did not eat
行った	行かなかった	went / did not go
した	しなかった	did / did not do
来た	来なかった	came / did not come

For the core た-form rule, first master affirmative forms. Treat なかった as its own related conjugation pattern.

Examples in Context

Japanese	English	Note
昨日、映画を見た。	I watched a movie yesterday.	Casual plain-past statement
先週、新しい靴を買った。	I bought new shoes last week.	買う → 買った
駅まで歩いた。	I walked to the station.	歩く → 歩いた
電車で本を読んだ。	I read a book on the train.	読む → 読んだ
田中さんが来た。	Mr. Tanaka came.	Irregular 来る → 来た
もう宿題をした？	Have you done your homework yet?	Casual question
これは京都で撮った写真です。	This is a photo I took in Kyoto.	Past clause modifies 写真
昨日会った人は山田さんです。	The person I met yesterday is Ms. Yamada.	The understood object of 会った is 人
食べたことがありますか？	Have you ever eaten it?	Past experience
ご飯を食べた後で、散歩しました。	I took a walk after eating.	Completed action + 後で
仕事が終わったら、電話してください。	Please call me when you finish work.	た-form + ら
週末は本を読んだり、映画を見たりした。	At the weekend, I did things like reading books and watching movies.	た-form + り lists representative actions
日本に来たばかりです。	I have just arrived in Japan.	た-form + ばかり
朝ご飯を食べなかった。	I did not eat breakfast.	Plain past negative

Japanese often leaves out a subject or object when context makes it clear. For that reason, 食べた can mean “I ate,” “she ate,” or “they ate,” depending on the conversation. The verb itself does not change for person or number.

Common Mistakes

Attaching た directly to a godan verb

• Wrong: 読むた。
• Right: 読んだ。
• Why: Godan verbs undergo sound changes. Verbs ending in む, ぶ, or ぬ change to んだ.

Using the regular く pattern for 行く

• Wrong: 昨日、学校に行いた。
• Right: 昨日、学校に行った。
• Why: 行く is the major exception: it uses 行った, not 行いた.

Treating every -る verb as ichidan

• Wrong: 七時に帰た。
• Right: 七時に帰った。
• Why: 帰る is a godan verb, so final る changes to った. Learn common godan -る verbs as complete vocabulary items.

Confusing plain and polite endings

• Wrong: 昨日、映画を見たです。
• Right: 昨日、映画を見た。 / 昨日、映画を見ました。
• Why: Do not normally add です to a sentence-final plain verb to manufacture politeness. Use either the plain past or the ます-form past.

Putting a polite past form inside a noun phrase

• Wrong: 昨日買いました本
• Right: 昨日買った本
• Why: A clause directly modifying a noun uses a plain form. The complete polite sentence can be 昨日買った本です, “It is the book I bought yesterday.”

Assuming た always corresponds to English “-ed”

• Misleading match: もう食べた？ = “Did you already eat?” only
• Natural alternatives: “Have you eaten yet?” / “Did you eat already?”
• Why: Japanese marks the event as completed, but English chooses simple past or present perfect according to context and dialect. Translate the meaning, not the ending mechanically.

Usage Notes

The sentence-final た-form belongs mainly to plain style. It is natural among close friends, family members, and peers when the relationship allows casual speech. With a customer, teacher, or unfamiliar adult, 食べました is normally safer than 食べた. Characters in fiction may also use plain speech for personality, hierarchy, or emotional effect, so dialogue is not always a model for neutral politeness.

Inside a larger structure, plain form is normal regardless of the overall politeness level. Compare 買った本だ and 買った本です: both use 買った before 本, while only the final copula—だ or です—changes the overall style.

Japanese past marking is based on how an event is presented, not on matching every English tense one-to-one. A completed event can be translated by English simple past or present perfect. Context words such as 昨日 (“yesterday”), もう (“already”), and まだ (“yet/still”) often guide the interpretation.

Beyond the Basics / Advanced Use

You do not need to master all of these patterns at A2, but you will repeatedly see the た-form used as a building block.

Relative clauses do not use “who,” “that,” or “which”

A relative clause (a clause that describes a noun) comes directly before the noun:

• 私が昨日買った本 — the book that I bought yesterday
• 東京で会った人 — the person whom I met in Tokyo

Japanese needs no separate relative word equivalent to English “that” or “who.” A particle may also disappear where English expects an object: 私が本を買った becomes 私が買った本. The missing role is understood from the noun following the clause.

Experience with たことがある

The pattern た-form + ことがある says that an event has occurred at least once in someone’s experience:

• 富士山に登ったことがあります。 — I have climbed Mount Fuji.
• 納豆を食べたことがありません。 — I have never eaten natto.

This is not merely a report about one specified past occasion. 昨日、納豆を食べた reports yesterday’s event; 納豆を食べたことがある describes life experience.

Sequence with た後で

Use た-form + 後で/後に for “after doing” because the first action is complete before the next one:

• シャワーを浴びた後で、寝ます。 — I go to bed after taking a shower.

By contrast, “before doing” uses the dictionary form: 寝る前に, not 寝た前に.

たら, たり, and ばかり

Several later patterns visibly contain the た-form:

Pattern	Core use	Example	Meaning
た-form + ら	if; when	着いたら連絡して。	Contact me when you arrive.
た-form + り	representative actions	掃除したり料理したりする。	Do things like cleaning and cooking.
た-form + ばかり	recently completed action	今着いたばかりです。	I have just arrived.

The た inside たら does not necessarily make the whole meaning past. 着いたら連絡して concerns a future arrival. Here, the form helps present the arrival as completed before the requested contact.

Completed realization and discovery

In narrative or spontaneous speech, た can mark the moment when a state is recognized or a sought item appears:

• あった！ — There it is! / I found it!
• 分かった。 — Got it. / I understand.

Literal English past translations (“there was,” “I understood”) may sound unnatural. These expressions still present a change or realization as having reached completion.

Practice Tips

1. Pair every て-form with its た-form. Say 書いて・書いた, 読んで・読んだ, and 話して・話した aloud. This reduces the task to changing て/で into た/だ.
2. Sort verbs by final kana. Make five godan groups—う/つ/る, む/ぶ/ぬ, く, ぐ, and す—then add 行く, する, and 来る as exceptions to retrieve separately.
3. Use one event in three frames. For example: 映画を見た (“I watched a movie”), 見た映画 (“the movie I watched”), and 映画を見たことがある (“I have watched that movie before”). This shows that the same form can end a sentence or sit inside a larger phrase.

Related Concepts

• Prerequisite: て-Form — the た-form uses the same verb groups and sound changes.
• Next step: Experience ことがある — combines the た-form with ことがある to describe past experience.
• Next step: 前/後 (before/after) — contrasts dictionary form + 前に with た-form + 後で.
• Next step: Tara Conditional — adds ら to the た-form for “if” and “when.”
• Later study: Bakari Expressions — includes た-form + ばかり for an action completed recently.