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My friend said:

> うたっちゃだめだから。

Is the っちゃ a colloquial replacement for っては in this case?
CC BY-SA 3.0
2017-01-02T09:47:42.933
42196
2018-12-24T18:44:08.550
2018-12-24T18:44:08.550
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question
grammar colloquial-language contractions
っては replaced with っちゃ？
Precisely.

In meaning,

「ては」＝「ちゃ」, 「ちゃあ」.

Thus,

> 「うたっちゃだめだから。」

means:

> "You shouldn't sing (it/this song/here/now, etc)."
CC BY-SA 4.0
2017-01-02T09:53:25.073
42197
2018-12-23T14:46:00.017
2018-12-23T14:46:00.017
42196
answer