The difference between ようVへん and ようVん
While ようVへん is used when the subject is third person (he/she/it), ようVん is mainly used when the subject is first person (I). It should be noted that ようVん can be used with questions when the subject is the second person (you).
Subjectivity with ようV and ようVん
ようVん is used not only with the ability negative potential but also when expressing disgust, blame, and surprise. In the latter case, the よう in ようVん is the same meaning of よく in standard Japanese.
disgust/blame| Standard | そんな恥ずかしいことよくできるね。 |
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| Kansai-ben | そんな恥ずかしいことようするなあ。 |
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| English | I can't do that--it would be so embarrassing. |
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surprise| Standard | 君、よく食べるねえ。 |
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| Kansai-ben | あんた、よう食べるなあ。 |
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| English | You sure do eat a lot. |
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disgust/blame| Standard | そんなひどいことできないよ。 |
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| Kansai-ben | そんなえげつないことようせんわ。 |
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| English | I couldn't do something that awful. |
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よう言わんわ
The common phrase "よう言わんわ" does not just mean to "not have much to say", but implies that the speaker is strongly disgusted and they have nothing to say about the topic.
| Standard | あいつ、またうわきしたのか。もう、何も言う言葉がないよ。 |
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| Kansai-ben | あいつ、またうわき*しよったんか。もう、よう言わんわ。 |
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| English | Has he been cheating again? I don't have anything more to say (about that). |
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*うわき = unfaithful; cheat on someone
When to use V? (potential) へん and V (potential) ん
Only V (potential) へん and V (potential) ん can be used when the speaker wants to do something but they are unable to. ようVへん and ようVん cannot be used in that case.
V (potential) へん| Standard | 今、ダイエット中だから、甘いもの食べられないんだ。 |
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| Kansai-ben | 今、ダイエット中やから、甘いもん食べられへんねん。 |
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| English | Since I'm on a diet, I can't have anything sweet. |
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