| Hi, I wouldn't know about the American English part of your question since I'm from the UK but for me the only acceptable sentence is number (1). |
sitifan What's the difference in meaning Psychological distance might be a way to describe the difference. wouldn't know is more distant, more indirect, more exculpatory perhaps. don't know is more open, more straightforward, more direct.
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sitifanWhat's the difference in meaningPsychological distance might be a way to describe the difference.