Casual contractions (〜てる・〜とく・〜ちゃ)
the shortened forms of ている, ておく, ては and では
ている → てる · ておく → とく · ては → ちゃ · では → じゃ
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Casual Japanese squeezes common patterns. You've met ちゃう (てしまう) and なきゃ (なければ); here are the others you'll hear constantly:
- ている → てる: 何してるの?, "what are you doing?"; でいる → でる: 読んでる.
- ておく → とく: 冷蔵庫に入れとくね, "I'll put it in the fridge"; でおく → どく.
- ては → ちゃ: 撮っちゃだめ, "you can't take photos"; では → じゃ: 飲んじゃだめ.
They conjugate like the full forms: といた, といて; てた, てない.
These are normal speech, not slang, but they don't belong in writing or formal situations. Recognising them matters most: in anime, dramas and chat, the full forms are the unusual ones.
Register: Casual: everyday speech, messages and manga.
Examples
今、何してるの?
What are you doing right now?
飲み物は冷蔵庫に入れとくね。
I'll put the drinks in the fridge.
ここで写真を撮っちゃだめだよ。
You're not allowed to take photos here.
宿題、もうやっといたよ。
I've already done the homework.
雨、まだ降ってる?
Is it still raining?
お酒を飲んじゃだめ。
You mustn't drink.