This cheat sheet covers the three major Japanese verb forms students use most often: te-form, masu-form, and plain form. These forms appear in conversations, classroom directions, writing, and grammar patterns. A clear reference helps students identify verb groups, choose the right ending, and avoid mixing polite and casual styles.
It is especially useful when moving from memorized phrases to building original sentences.
Key Facts
- Japanese verbs are commonly grouped as ru-verbs, u-verbs, and irregular verbs, and the group determines how the verb changes form.
- For most ru-verbs, remove る and add ます for masu-form, as in 食べる becomes 食べます.
- For most ru-verbs, remove る and add て for te-form, as in 見る becomes 見て.
- For u-verbs, masu-form changes the final u sound to the i sound plus ます, as in 書く becomes 書きます and 話す becomes 話します.
- U-verb te-form depends on the final syllable: う, つ, る become って; む, ぶ, ぬ become んで; く becomes いて; ぐ becomes いで; す becomes して.
- Plain present affirmative is the dictionary form, as in 行く, while plain present negative usually changes to the a-sound plus ない, as in 行く becomes 行かない.
- Plain past affirmative often matches the te-form sound pattern with た or だ, as in 書いて becomes 書いた and 読んで becomes 読んだ.
- The main irregular verbs are する, which becomes します, して, しない, した, and 来る, which becomes 来ます, 来て, 来ない, 来た.
Vocabulary
- Te-form
- A verb form ending in て or で that connects actions and is used in many grammar patterns such as requests and ongoing actions.
- Masu-form
- A polite verb form used in formal speech, classroom Japanese, and respectful everyday conversation.
- Plain form
- A casual verb form used with friends, in dictionaries, and inside many sentence patterns.
- Ru-verb
- A verb group that usually ends in る and often conjugates by dropping る before adding a new ending.
- U-verb
- A verb group whose final syllable changes sound before many endings, such as 書く becoming 書きます.
- Irregular verb
- A verb that does not follow the usual ru-verb or u-verb patterns, especially する and 来る.
Common Mistakes to Avoid
- Treating every verb ending in る as a ru-verb is wrong because many verbs such as 帰る and 走る are u-verbs and follow different patterns.
- Using ます after te-form, such as 食べてます when the intended form is 食べます, mixes patterns unless you specifically mean a shortened form of 食べています.
- Forgetting the で endings in u-verb te-form is wrong because verbs ending in む, ぶ, ぬ, and ぐ use で, as in 読んで and 泳いで.
- Using dictionary form in a polite sentence by accident can sound too casual because 行く and 行きます have different politeness levels.
- Conjugating する and 来る like regular verbs is wrong because they are irregular and must be memorized as して, します, 来て, and 来ます.
Practice Questions
- 1 Change 食べる to masu-form, te-form, plain negative, and plain past.
- 2 Change 書く, 読む, and 話す to te-form.
- 3 Complete the sentence with the correct polite form: 毎日、日本語を ____ 。 Use 勉強する.
- 4 Explain why 見る and 帰る do not conjugate the same way even though both end in る.
Understanding Verb Forms (te, masu, plain) Reference
Verb endings do more than show when an action happens. They show the level of formality and connect one idea to the next. Japanese verbs do not normally change for the person doing the action.
The same verb can describe I eat, you eat, or they eat when the context makes the subject clear. This makes endings especially important.
A listener uses them to understand the speaker’s attitude, time frame, and how one clause relates to another. Learning a verb as a set of linked forms is more useful than learning one dictionary entry alone.
The te-form is often a bridge to another part of the sentence. It can join actions, such as eating before leaving, but it does not carry past or present tense by itself. The final verb in a chain often gives the whole sequence its time meaning.
The te-form appears in requests with kudasai, ongoing actions with iru, permission expressions, and prohibitions. These patterns need to be learned as whole units.
A sentence ending in te can sound unfinished unless it is part of a familiar spoken pattern. Pay attention to what follows the te-form, because that following word usually tells you its job.
The masu style helps speakers sound polite in school, workplaces, shops, and conversations with people they do not know well. Politeness is not simply a matter of being friendly. It reflects social distance and the setting.
A sentence can become past or negative while keeping this polite style. Students often make an error by beginning politely, then ending casually. Try to keep one style through a short conversation or written paragraph.
Japanese speakers may use a plain form inside a longer polite sentence when it comes before a noun or a grammar expression. This is normal and does not mean the speaker has suddenly become rude.
Plain forms are essential because they appear far beyond casual conversation. They are used before nouns to describe people and things, in quotations, in diary writing, and in many grammar patterns. The plain present form can describe a regular habit, a general fact, or a future action.
Context decides which meaning fits. Japanese does not use a separate future verb ending in the way English often does.
A past form usually marks a completed action, while a negative form can describe something that does not happen, did not happen, or is not planned. Time words such as tomorrow, every day, and yesterday provide important clues.
Verb group labels are useful, but the final character alone is not always enough to identify a verb. Some verbs ending in ru behave like u-verbs. Hairu, meaning to enter, and kaeru, meaning to return, are common examples.
Learn these as exceptions early. Another important exception is iku, meaning to go, which has an unusual te-form and past form. Build a small table for each new verb with its dictionary, polite, te, negative, and past forms.
Say the forms aloud in short sentences. This helps you notice sound patterns instead of relying only on spelling. Accuracy improves when you check the verb group before changing any ending.