This question came up from a previous SO post [Katakana ダメ to end a sentence -
emphasis?](https://japanese.stackexchange.com/questions/15015/katakana-%E3%83%80%E3%83%A1-to-
end-a-sentence-emphasis)

> 全ての敵を倒す必要はないが、逃げてばかりではダメ。
>
> It is not necessary to beat all enemies, but you can't run away all the time

The question was raised that this is similar to using ～ては (いけない・ならない). ダメ
gives it a harsher or more colloquial feel.

Comparing all three in the same sentence, what are the differences in their
meanings?
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2014-03-24T14:59:53.670
15023
2017-03-16T21:03:29.627
2020-06-17T08:18:27.500
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question
nuances colloquial-language
Difference between ではダメ、いけない、ならない to end a sentence
In descending order of formality: ならない、いけない、ダメ.

There is no difference in meaning.
CC BY-SA 3.0
2014-03-24T15:48:30.733
15027
2017-03-16T21:03:29.627
2017-03-16T21:03:29.627
9971
15023
answer