This godan te-form group is the simplest of all — one clean rule and one exception. Any godan verb whose dictionary form ends in く softens the く to a vowel い before て, giving いて. Linguists call this the イ音便 (i-onbin), the "i-vowel" change. Learn the rule, drill the single exception (行く → 行って), and you're done: this whole page is really "one rule plus one word."
The mechanism: く softens to a vowel
Historically, て attached to the stem: ka-ki + te, ki-ki + te, a-ru-ki + te. The き softened — the hard k dropped out and left just the vowel い — and て followed cleanly:
- 書く ka-ku → ka-*i-te* → 書いて
- 聞く ki-ku → ki-*i-te* → 聞いて
- 歩く a-ru-ku → a-ru-*i-te* → 歩いて
Unlike the doubling of the って group or the voicing of the んで group, nothing dramatic happens here — the consonant just melts into a vowel. Note that く is unvoiced, so the connector stays the plain て (its voiced twin ぐ → いで keeps the voicing; see the ぐ group).
The full derivation table
| Dictionary | て-form | Reading |
|---|---|---|
| 書く (to write) | 書いて | kaku → kaite |
| 聞く (to listen, to ask) | 聞いて | kiku → kiite |
| 歩く (to walk) | 歩いて | aruku → aruite |
| 働く (to work) | 働いて | hataraku → hataraite |
| 置く (to put, to leave) | 置いて | oku → oite |
| 泣く (to cry) | 泣いて | naku → naite |
| 咲く (to bloom) | 咲いて | saku → saite |
| 引く (to pull) | 引いて | hiku → hiite |
| Exception: 行く → 行って (iku → itte), not ×行いて. | ||
In natural sentences
お名前はここに書いてください。
onamae wa koko ni kaite kudasai
Please write your name here.
そのニュースを聞いて、本当にびっくりした。
sono nyūsu o kiite, hontō ni bikkuri shita
I was genuinely shocked when I heard that news.
駅まで歩いて十分くらいかかるよ。
eki made aruite juppun kurai kakaru yo
It takes about ten minutes on foot to the station.
母はもう三十年、同じ病院で働いている。
haha wa mō sanjū-nen, onaji byōin de hataraite iru
My mother has worked at the same hospital for thirty years now.
荷物はそこに置いておいて、あとで片付けるから。
nimotsu wa soko ni oite oite, ato de katazukeru kara
Just leave the bags there — I'll tidy up later.
庭の桜が咲いて、とてもきれいだよ。
niwa no sakura ga saite, totemo kirei da yo
The cherry blossoms in the garden have bloomed and look really pretty.
赤ちゃんがずっと泣いていて、昨夜は眠れなかった。
akachan ga zutto naite ite, sakuya wa nemurenakatta
The baby cried all night, so I couldn't sleep.
The exception: 行く → 行って
By its final kana, 行く should give ×行いて. It does not. 行く → 行って — "to go" takes the doubling って pattern instead, exactly like a つ- or る-verb. This is the single high-frequency exception in the entire godan て-system, and because 行く is one of the most common verbs in the language, you'll produce it constantly. Drill 行って until it's automatic; treat it as a one-off you simply memorize.
ちょっとコンビニに行ってくるね。
chotto konbini ni itte kuru ne
I'm just gonna run to the convenience store.
週末、京都に行ってみたいな。
shūmatsu, Kyōto ni itte mitai na
I'd love to go to Kyoto this weekend.
The same exception carries into the auxiliary 〜ていく ("go on doing / away"), which becomes 〜ていって: 持っていって ("take it with you"), 歩いていって ("walk there and go"). Wherever 行く appears, expect 行って. For the full story, see 行く: the te-form exception.
Free bonus: it's identical to the past 〜いた
As with every godan group, this change matches the plain past た-form exactly — only the final vowel differs: いて ↔ いた. And the exception carries over too: just as 行く breaks the pattern in the て-form (行って), it breaks it identically in the past (行った).
| Dictionary | て-form (いて) | Past (いた) |
|---|---|---|
| 書く (to write) | 書いて | 書いた |
| 歩く (to walk) | 歩いて | 歩いた |
| 行く (exception) | 行って | 行った |
The voiced twin ぐ works the same way on both sides: 泳ぐ → 泳いで / 泳いだ, with the voicing surviving into で / だ. See the ぐ group and the て／た parallel.
昨日は駅まで歩いたけど、今日はバスで行く。
kinō wa eki made aruita kedo, kyō wa basu de iku
Yesterday I walked to the station, but today I'll take the bus.
How this differs from English
English changes "go" irregularly for the past — "go/went" — but it never touches the verb just to connect it: "write and…," "walk and…," "go and…" all keep the verb whole. Japanese reshapes the ending for the connection, and 行く is the one place where the regular reshaping (いて) is overruled by an older, irregular one (って). It's the same species of irregularity as English "went": high-frequency verbs resist the regular pattern and keep an archaic form. There's no logic to reconstruct — just memorize 行って the way you once memorized "went."
Common mistakes
❌ 週末、京都に行いてみたい。
shūmatsu, Kyōto ni iite mitai
Incorrect — 行く is the exception; it takes って, giving 行って.
✅ 週末、京都に行ってみたい。
shūmatsu, Kyōto ni itte mitai
I want to go to Kyoto this weekend.
❌ お名前はここに書きてください。
onamae wa koko ni kakite kudasai
Incorrect — 書く isn't left as a stem; the く softens to い: 書いて.
✅ お名前はここに書いてください。
onamae wa koko ni kaite kudasai
Please write your name here.
❌ 学校まで歩って通っている。
gakkō made arutte kayotte iru
Incorrect — 歩く is a regular く-verb → 歩いて; only 行く takes って.
✅ 学校まで歩いて通っている。
gakkō made aruite kayotte iru
I walk to school (and commute that way).
❌ 母は病院で働っている。
haha wa byōin de hataratte iru
Incorrect — over-applying って to a く-verb; 働く → 働いて.
✅ 母は病院で働いている。
haha wa byōin de hataraite iru
My mother works at a hospital.
Key takeaways
- く → いて — the i-vowel change (イ音便); the く softens to a vowel, and the connector stays plain て.
- Its voiced twin ぐ → いで keeps the voicing — a separate ぐ group.
- The one exception: 行く → 行って (not ×行いて) — the single high-frequency irregular in the whole godan て-system. Drill it.
- 行って, 行った, 言って, 言った all read itte / itta; kanji and context separate them.
- Don't over-correct the other way: every other く-verb (書く, 歩く, 働く…) is perfectly regular いて.
Now practice Japanese
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Start learning Japanese→Related Topics
- Godan ぐ → いでN4 — How godan verbs ending in ぐ form the te-form with いで — the same イ音便 as く, but voiced because ぐ is a voiced sound.
- Godan す → してN4 — How godan verbs ending in す form the te-form as して with no euphonic change at all — the most predictable godan group.
- The te-form Song: All Rules on One PageN4 — The complete te-form system on a single page, built around the classic learner mnemonic — う・つ・る→って, む・ぬ・ぶ→んで, く→いて, ぐ→いで, す→して, plus ichidan and the two irregulars.
- Godan う・つ・る → ってN4 — The first godan te-form group: verbs ending in う, つ, or る take the doubling change (促音便) to form って — 買う→買って, 待つ→待って, 取る→取って — plus the る-verb trap.
- The て-form: Japanese's Universal ConnectorN4 — Why the tenseless, politeness-free て-form is the single most productive conjugation in Japanese — the hinge that feeds requests, progressives, sequence, permission, and dozens more constructions.
- 行く: The te-form ExceptionN4 — 行く（いく, to go）is a perfectly regular 五段 -く verb in every cell except one — its te-form and past are the 促音便 forms 行って／行った, never the ×行いて that 書く predicts.