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When contracting -てしまう or -でしまう to -ちゃう or -ちゃ, what happens in the -って and
-んで cases?

For example, does 洗ってしまう become あらちゃう or あらっちゃう?

Similarly, does 喚んでしまわない become 喚んじまわない or 喚じまわない?

I'm trying to write a conjugator, but my Japanese is limited.
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2019-01-29T16:49:17.600
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2019-01-29T18:13:47.567
2019-01-29T18:13:47.567
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question
conjugations contractions subsidiary-verbs
Regarding chau and cha contractions, what happens in -って and -んで cases?
The rule is fairly simple. Regardless of what comes before `て`/`で`:

  * `てしまう` contracts to `ちゃう` or `ちまう`.
  * `でしまう` contracts to `じゃう` or `じまう`.

The character before `て`/`で`, which is often `っ` or `ん` in godan verbs, must
not be removed nor changed.

All of these conjugate like an ordinary godan verb such as 使う and 合う. Note
that ちまう/じまう sounds fairly rough (it almost sounds like delinquent/gang speech
in fiction).

Therefore:

  * 洗ってしまう → 洗っちゃう (or 洗っちまう)
  * 洗ってしまわない → 洗っちゃわない (or 洗っちまわない)
  * 洗ってしまった → 洗っちゃった (or 洗っちまった)
  * 呼んでしまう → 呼んじゃう (or 呼んじまう)
  * 呼んでしまわない → 呼んじゃわない (or 呼んじまわない)

For other godan verbs:

  * 泣いてしまう → 泣いちゃう (or 泣いちまう)
  * 行ってしまう → 行っちゃう (or 行っちまう)

For ichidan verbs:

  * 見てしまう → 見ちゃう (or 見ちまう)
  * 食べてしまう → 食べちゃう (or 食べちまう)

* * *

[This chart](https://japanese.stackexchange.com/a/18159/5010) is helpful, too.
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2019-01-29T17:26:08.200
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2019-01-29T17:34:03.320
2019-01-29T17:34:03.320
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answer