Japanese Te-Form: Conjugation Rules and Sound Changes

The te-form is the joint of the Japanese language. On its own it means nothing — 食べて (tabete) is not a word you can translate in isolation. What it does is attach: it lets one verb carry another verb, a request, a permission, or a state behind it.

That is why the te-form shows up in nearly every Japanese sentence past the beginner stage. 食べています (tabete imasu, "am eating"), 見てください (mite kudasai, "please look"), 行ってから (itte kara, "after going") — all the same て doing the same job: joining.

What the te-form actually does

Ten patterns, one form. Get the form right and all ten open at once. That is why this page is worth real study time — the te-form is the highest-leverage single conjugation in Japanese.

The three groups do three different things

Everything depends on the group, and the group is decided by the dictionary form — the plain form in the dictionary. If you are not sure which group a verb is in, verb groups and conjugation covers that first.

• Ichidan verbs (食べる, 見る, 起きる): delete る, add て. Nothing else.
• Godan verbs (書く, 飲む, 買う): the last kana changes, and the change depends on which kana it is. This is a sound change — Japanese calls it 音便 (onbin) — not an arbitrary rule.
• The two irregulars: する → して (shite), 来る → 来て (kite). Memorise them.

The full sound-change table

Nine endings, five outcomes. This is the table to learn.

There is real logic under the table, and it is worth seeing because it turns twelve rows into three ideas.

The っ group (う・つ・る). These three collapse to a glottal stop — a held beat then て. 買って, 待って, 帰って all sound like a small pause before the て. If you say them out loud, the spelling follows your mouth.

The ん group (む・ぶ・ぬ). These are nasal sounds, so the verb stays nasal: んで. Note that the て becomes voiced — it is で, not て. 読む → 読んで, not 読むて.

The い group (く・ぐ・す). く → いて, ぐ → いで (again voiced), す → して. す is the odd one out and simply has to be remembered, but it is a very common ending — 話す, 出す, 探す, 消す.

The voicing rule is not decoration. む・ぶ・ぬ and ぐ produce で; everything else produces て. If a ん or an い is in front, it is voiced.

The exceptions worth knowing

行く goes to 行って

行く (iku, "to go") ends in く, so the rule says 行いて. The real form is 行って (itte). This is a genuine irregularity inside the godan group, and it is the one everyone meets early because 行く is one of the most common verbs in the language. 行ってきます (itte kimasu, "I'm off" — literally "I'll go and come back") is a set phrase built on it.

Its compounds follow: 持って行く (motte iku, "to take along") → 持って行って (motte itte). No other く verb does this — 書く (kaku), 聞く (kiku), 働く (hataraku) and 歩く (aruku) are all regular いて.

The -eru / -iru verbs that are actually godan

A short list of verbs end in える or いる but belong to the godan group, so they take って, not て:

帰って (kaette) and 入って (haitte) are the two that catch people most often, because 帰る (kaeru) and 入る (hairu) look exactly like ichidan verbs. The list is short enough to memorise as vocabulary.

Adjectives use て too — with a different rule

The te-form is not only for verbs, and mixing up the two adjective rules is a common slip.

• い-adjectives: drop い, add くて. 高い (takai, "expensive") → 高くて (takakute). Exception: いい (ii, "good") → よくて (yokute).
• な-adjectives and nouns: add で. 静か (shizuka, "quiet") → 静かで (shizuka de).

So この店は安くて、おいしい (kono mise wa yasukute, oishii, "this shop is cheap and delicious") joins two adjectives, and 静かで、きれい (shizuka de, kirei, "quiet and pretty") does the same job for な-adjectives. Full coverage is in Japanese adjectives.

The te-form as "and": sequencing and reasons

English links two actions with "and" or with a comma. Japanese links them by putting everything before the last verb into the te-form.

• 朝ご飯を食べて、学校へ行きました (asagohan o tabete, gakkou e ikimashita) — I ate breakfast and went to school
• シャワーを浴びて、寝ました (shawaa o abite, nemashita) — I took a shower and went to bed

Notice ました appears only once, on the final verb. The tense of the whole sequence is decided by the last verb, and everything in the te-form before it is understood to have happened first. If you put every verb in the past tense — 食べました、行きました — you get two separate statements, which sounds like a list rather than a story.

The te-form also carries reason, and this use catches learners out because it looks identical to the "and" use.

• 風邪をひいて、学校を休みました (kaze o hiite, gakkou o yasumimashita) — I caught a cold, so I stayed home from school
• 道に迷って、遅れました (michi ni mayotte, okuremashita) — I got lost and was late

Both readings are grammatical for the same sentence. Which one applies is decided by whether the two events are merely sequential or causally linked, and in practice by what makes sense. 風邪をひいて、学校を休みました would be a strange sentence if the two clauses were unrelated.

How to drill it so it sticks

Reading the table is not learning it. The table is a lookup; you want recall.

Do it out loud, in groups, not one verb at a time. Say the って row — 買う、買って、待つ、待って、帰る、帰って — then the んで row, then the いて row. Your ear picks up the pattern faster than your memory does, and the sound change is genuinely a sound change.

Anchor one verb per row as a reference. 書く for いて, 読む for んで, 買う for って, 話す for して, 泳ぐ for いで. When you meet a new verb, compare it to your anchor rather than re-deriving the rule.

Type it, do not just read it. Conjugation is a production skill. Seeing 書いて and thinking "yes, that is right" is recognition; producing kaite from 書く is recall. They are different, and only the second one works in conversation or under exam pressure.

A ten-second self-test

Cover the right-hand column and answer out loud. If you get all ten without hesitating, the form is yours.

Note that the romaji does not show you the voicing — kaite and oyoide differ only in one letter, and katte and matte are identical in shape. When you type, you have to know the d. That is one more reason typing forces the rule into memory where reading the table does not.

Common mistakes for English speakers

Voicing the wrong half. 読んで (yonde) has a voiced で, and learners who have just memorised "て" write 読むて. The rule is mechanical: after ん or い it is always で.

Treating 行く as regular. 行いて is wrong; it is 行って (itte). This is the single most frequent te-form error, precisely because the verb is so common.

Assuming every -eru verb is ichidan. 帰る is godan, so 帰って, not 帰て.

Trying to translate the te-form by itself. English speakers look for a single English word for 食べて and find none. The te-form is a connective, closer to English "and" or a comma than to a tense. Its meaning comes entirely from what follows.

Confusing 〜てある and 〜ている. 窓が開いている (mado ga aite iru) describes a state — the window is open, nobody in particular is responsible. 窓が開けてある (mado ga akete aru) means the window has been deliberately opened by someone. The first is an observation, the second implies an agent. See te-iru for the state side.

Forgetting that 〜てください is a request, not a command. It is polite, but it is still an instruction. For "would you mind doing", Japanese prefers 〜ていただけませんか.

Where the te-form leads

Once the sound changes are automatic, the te-form stops being a conjugation and becomes a building block. The next layer — what attaches to it, and how the meaning shifts — is covered in te-form auxiliary verbs, which takes the permission and prohibition patterns (てもいい, てはいけない, てください) from the table above and works through them properly.

Build the te-form into your hands by typing full sentences — Romaji.live practice has you produce forms like tabeteimasu and ittekaramade character by character from real sentences, and tells you immediately when the ending is wrong. If you are still shaky on which group a verb belongs to, start with verb classification; and if you want to check a reading, the romaji converter will spell any sentence out.