The て-form: learn this one conjugation and a dozen grammar points open up

If you learn only one conjugation well in your first months of Japanese, make it the て-form (te-kei). It is the single most productive form in the language — by itself it says nothing, but it's the connector that dozens of other grammar points bolt onto.

The conjugation has a few rules, and there is one classic exception that trips everyone. We'll get you through both, then show you what the て-form unlocks so you know why the effort pays off.

Before the rules, here's the payoff. Once you can make the て-form of any verb, all of these become available instantly:

〜てください (-te kudasai — "please do ~"): 見てください (mite kudasai — "please look").

〜ています (-te imasu — ongoing action / state): 食べています (tabete imasu — "I'm eating").

〜てもいいです (-te mo ii desu — "you may ~"): 入ってもいいですか (haitte mo ii desu ka — "may I come in?").

〜てはいけません (-te wa ikemasen — "you must not ~"): 触ってはいけません (sawatte wa ikemasen — "don't touch").

〜てから (-te kara — "after doing ~"): 食べてから行きます (tabete kara ikimasu — "I'll go after I eat").

Linking actions like English commas: 起きて、顔を洗って、出かけます (okite, kao o aratte, dekakemasu — "I get up, wash my face, and go out").

One form, all of that. That's the return on investment.

Start with the verbs that have almost no rules.

Group 2 (る-verbs / ichidan): just drop る and add て. 食べる → 食べて (taberu → tabete), 見る → 見て (miru → mite), 寝る → 寝て (neru → nete). That's the whole rule.

Group 3 (irregular, only two verbs): する → して (suru → shite, "do"), 来る → 来て (kuru → kite, "come"). Memorize the pair and you're done forever.

If you're not sure whether a verb is Group 1 or Group 2, that's a separate skill — see our verb-groups guide. For now, know that Group 2 and 3 are the painless part.

Group 1 verbs (う-verbs / godan) change their ending depending on the last sound of the dictionary form. There are five buckets, and a famous mnemonic makes them stick.

う・つ・る → って: 買う → 買って (kau → katte, "buy"), 待つ → 待って (matsu → matte, "wait"), 帰る → 帰って (kaeru → kaette, "return").

む・ぶ・ぬ → んで: 飲む → 飲んで (nomu → nonde, "drink"), 遊ぶ → 遊んで (asobu → asonde, "play"), 死ぬ → 死んで (shinu → shinde, "die").

く → いて: 書く → 書いて (kaku → kaite, "write").

ぐ → いで: 泳ぐ → 泳いで (oyogu → oyoide, "swim"). Note the voiced で — it follows the voiced ぐ.

す → して: 話す → 話して (hanasu → hanashite, "speak").

Many learners chant it as a rhythm: "u-tsu-ru, tte / mu-bu-nu, nde / ku, ite / gu, ide / su, shite." Say it out loud a few times a day for a week and the conjugation becomes automatic.

By the く → いて rule, 行く (iku, "to go") should become 行いて. It doesn't. The te-form of 行く is 行って (itte), following the う・つ・る pattern instead.

This is the most common verb in the entire exception list, so the error shows up constantly. 行って, not 行いて. Burn it in.

A couple of other small traps: 帰る (kaeru, "return") is Group 1, so it's 帰って (kaette), not 帰て — even though it ends in る and looks like a Group 2 verb. And 〜ぬ verbs are almost nonexistent — 死ぬ (shinu) is essentially the only one you'll meet, so んで for the む・ぶ・ぬ group is really "む・ぶ and that one ぬ verb".

The connecting idea extends past verbs. To link descriptions, adjectives and nouns have their own て-style form.

い-adjectives: drop い, add くて. 安い → 安くて (yasui → yasukute, "cheap and ~"): この店は安くて、おいしいです (kono mise wa yasukute, oishii desu — "this shop is cheap and tasty").

な-adjectives and nouns: add で. 静か → 静かで (shizuka → shizuka de, "quiet and ~"); 学生 → 学生で (gakusei de, "is a student and ~").

The one irregular adjective: いい (ii, "good") becomes よくて (yokute), not いくて — because いい secretly conjugates from よい (yoi). You'll meet this again in the past tense (よかった), so learn it now.

Once verbs, adjectives, and nouns all have a て-form in your head, you can chain a whole sentence together the way Japanese actually does it — clause after clause, each handing off to the next.