The て-form: One Rule Set, a Dozen Uses

The て-form is the single highest-value thing a beginner can automate. It is the hinge for requests, ongoing actions, permission, sequencing and half of intermediate grammar.

Making it

Group 2 (ru-verbs): drop る, add て. 食べる → 食べて.

Group 1 (u-verbs): by ending —

• う・つ・る → って (買う → 買って)
• む・ぶ・ぬ → んで (飲む → 飲んで)
• く → いて (書く → 書いて), ぐ → いで (泳ぐ → 泳いで)
• す → して (話す → 話して)

Irregulars: する → して, 来る → 来て, and 行く → 行って, which breaks its own row and always will.

What it buys you

• 〜てください — a polite request. 待ってください.
• 〜ています — happening now, or an ongoing state. 食べています.
• 〜てもいいですか — asking permission. 入ってもいいですか.
• Linking clauses — 起きて、朝ご飯を食べて、出かけました. One て-chain replaces three sentences.

Getting it automatic

Conjugation charts do not produce speed; retrieval does. Take twenty verbs you already know, convert them out loud, then read sentences containing the forms. Aim for the point where 飲んで arrives without a detour through "む goes to んで". A week of five-minute passes usually does it.

The mistake to avoid

〜ています is not always "am doing". With verbs of change — 結婚しています, 知っています — it describes a resulting state: married, know. Reading it as a present continuous produces sentences that mean something else entirely.