Common Japanese Mistake: Te-Form Errors and How to Fix Them

2026年4月23日2026年4月27日

TOC

Why Te-Form Causes So Many Mistakes

The te-form (て形) is one of the most important forms in Japanese — it connects actions, makes requests, expresses ongoing states, and appears in dozens of grammar patterns. Because it’s so versatile, mistakes with it are very common and very impactful.

Te-Form Formation Rules (Quick Review)

Verb group	Dictionary ending	Te-form change	Example
Group 1 (u-verbs)	う、つ、る	→ って	かう→かって、まつ→まって、とる→とって
Group 1	ぬ、ぶ、む	→ んで	しぬ→しんで、よぶ→よんで、のむ→のんで
Group 1	く	→ いて	かく→かいて (EXCEPT いく→いって)
Group 1	ぐ	→ いで	およぐ→およいで
Group 1	す	→ して	はなす→はなして
Group 2 (ru-verbs)	〜る (with e/i before)	Drop る → て	たべる→たべて、みる→みて
Irregular	する、くる	して、きて

Mistake 1: Wrong Group Classification

The most common error is treating a Group 1 verb as Group 2 because it ends in -る:

Verb	Wrong te-form	Correct te-form	Group
はいる (to enter)	はいて ✗	はいって ✓	Group 1 (い before る)
しる (to know)	して ✗	しって ✓	Group 1
かえる (to return)	かえて ✗	かえって ✓	Group 1
おくる (to send)	おくて ✗	おくって ✓	Group 1

Mistake 2: いく → いいて (NOT correct)

いく is the only く-ending verb that breaks the rule: it becomes いって, not いいて. This is the one exception to memorise.

Mistake 3: Using Te-Form Instead of Dictionary Form in Certain Patterns

Pattern	Needs	Wrong	Correct
〜ことができます	Dictionary form	たべてことができます	たべることができます
〜まえに	Dictionary form	たべてまえに	たべるまえに
〜ために	Dictionary form	べんきょうしてために	べんきょうするために

Quick Drill: Convert to Te-Form

よむ (to read)
たべる (to eat)
いく (to go)
くる (to come)
はなす (to speak)

Answers: 1. よんで / 2. たべて / 3. いって / 4. きて / 5. はなして

Yuka Struggles with て Form

Mistakes feel embarrassing in the moment but they are the fastest way to learn. Watch how Yuka makes a natural error — and how Rei explains the rule clearly enough to prevent it from happening again.

Yuka

Rei, I always mess up the て form. I wrote 飲んで correctly but then wrote 書いて wrong — I put 書んで.

Rei

Common mix-up! The て form rules depend on the verb’s dictionary ending. Verbs ending in む、ぬ、ぶ → んで (drink → 飲んで). But verbs ending in く → いて. So 書く (write) → 書いて, not 書んで.

Yuka

And what about いく — I heard it’s an exception?

Rei

Right! いく should follow the く rule and give いいて, but it’s an exception: いく → いって. Just memorise that one. Also: verbs ending in う、つ、る → って. Like 買う → 買って, 立つ → 立って.

Yuka

Is there a trick to remember all these patterns?

Rei

Group them by ending and practise the most common verbs in each group. む→んで: 飲む、読む、休む. く→いて: 書く、聞く、歩く. う→って: 買う、言う、思う. Make flashcards by group, not alphabetically. That connection is what makes the pattern stick.

5 Correct Sentences — Read These Aloud

Each sentence demonstrates the correct usage from this article. Say them aloud to lock in the right pattern.

コーヒーをのんで、しごとをはじめます。
I’ll drink coffee and then start work. (む→んで)
てがみをかいて、ポストにいれました。
I wrote a letter and put it in the post box. (く→いて)
えきにいって、きっぷをかいました。
I went to the station and bought a ticket. (いく→いって, exception)
ともだちとはなして、きもちがすっきりしました。
I talked with my friend and felt refreshed. (す→して)
てをあらってから、たべてください。
Please wash your hands before eating. (て form + から)

Your Turn! Correct the Mistake in the Comments

Here is a sentence with the error from this article. Can you fix it? Write the corrected version — and your own correct sentence — in the comments below.

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