N5 · Structured courses

～cha / ～ja: Casual Contraction of te wa

Learn the casual contraction ちゃ/じゃ from ては for "if you do X (bad outcome follows)." This lesson combines form, context, examples, common mistakes, and practice so you can use the pattern in real communication.

12 minNihongo Hub Editorial TeamPublished 2026-06-06Updated 2026-06-06

Learning objectives

  • Lesson goals: Learn the casual contraction ちゃ/じゃ from ては for "if you do X (bad outcome follows)."
  • Form and connection: [Verb te-form] ちゃ / [Verbで形] じゃ
  • Nuance in real use: Spoken Japanese has a "melting" quality — formal grammar contracts, blends, and morphs in casual speech. ちゃ/じゃ is step one of this process, marking the transition from "textbook Japanese" to "real Japanese."

Form and connection

[Verb te-form] ちゃ / [Verbで形] じゃ

Core Explanation

Learn the casual contraction ちゃ/じゃ from ては for "if you do X (bad outcome follows)."

Cultural Note

Spoken Japanese has a "melting" quality — formal grammar contracts, blends, and morphs in casual speech. ちゃ/じゃ is step one of this process, marking the transition from "textbook Japanese" to "real Japanese."

Practical examples

You mustn't say things like that.
You can't play here.
Don't forget, okay?

Common pitfalls

Build the base form before adding the pattern

Complete the required conjugation first. Do not keep polite and plain endings at the same time.

Match politeness to the situation

The examples are reliable starting points; relationships and context can still change the most natural wording.

Practice and answers

1. Write the connection formula for this lesson.
Show answer[Verb te-form] ちゃ / [Verbで形] じゃ
2. Explain the meaning of the first example.
Show answerYou mustn't say things like that.
3. Rewrite the final example using this lesson pattern.
Show answer忘わすれちゃだめだよ。 ([Verb te-form] ちゃ / [Verbで形] じゃ)

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