Is it an unpleasant mistake ?
Whether is a mistake that it is unpleasant to listen to when the person incorrectly uses verbal forms of past tense and article in English
Please, answer only native speakers of English

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Answer

Hi Alexei, I'm not exactly sure what you're asking.  Can you give an example of the type of mistake you mean?  And can you give me a better idea of what you mean by "unpleasant mistake"?