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This question came up from a previous SO post Katakana ダメ to end a sentence - emphasis?


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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possible duplicate of How to say "you may not [verb] here"? – istrasci Mar 24 '14 at 15:13

In the order of formality: ならない、いけない、ダメ.

There is no difference in meaning.

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