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N4普通形（２）
Plain Form (2): Casual Speech
Using plain form to actually talk casually — what drops, what changes, what stays polite.
From です／ます to casual
Plain form + dropped particles + rising pitch for questions. 食べますか→食べる？ 高いです→高い. 学生です→学生（だ）.
Common contractions
〜ている→〜てる, 〜ておく→〜とく, 〜てしまう→〜ちゃう, 〜なければならない→〜なきゃ, 〜という→〜って.
Register is a choice
Plain form with people close to or below you. Keep です／ます with strangers, customers, teachers, elders you don't know well.
Example usage
ねえ、宿題 もう やった？ — まだ やってない。
Hey, did you already do the homework? — Not yet.
今 手が ふさがってるから、あとで やっとくね。
My hands are full right now, so I'll take care of it later.
早く 出なきゃ、遅刻するよ。
I have to leave soon or I'll be late.
Your notes
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