I don't think "the" is "incorrect" in any of these. It's just bad style. When we're comparing items , it seems more natural to use the article.
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Avangi.When will you be [the] most regretful? To me, "the" is optional. In these cases, it seems more natural to use it, and perhaps a bit "high register" to deleteSo you don't think it's as bad as those in the first two?
Cool BreezeThe should be omitted in your last sentence as well for the very same reason. However, it sounds a little stilted to my ear and I might recast it. There's nothing wrong with it grammatically. It's just not often said and English is a language of fixed phrases that everybody usesHi, CB.
Avangido you mean that once the "the" is omitted, there's nothing wrong with the sentence grammatically?That's what I meant, Avangi. I'm sorry my wording was inaccurate.
Cool BreezeThe should be omitted in your last sentence as well for the very same reason.You mean the one in question, about the regret, CB?
TakaYou mean the one in question, about the regret, CB?Yes. That is your last sentence.