Could you give examples of some of the "should better" uses you have in mind?
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Anonymous I'm sure they are both used commonly.
I had better go to bed.
I should better go to bed.I can't imagine any native speaker saying "I should better go to bed". That only sounds like a non-native speaker error to me. What kind of native speakers have you been listening to, Anon? I assume they're not British or American. If you do a search in the C