0 #1 indicates that the speaker is not certain about something, and #2 indicates that the speaker has no clue at all about it. 0-
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01cite10Teo12cite101. I don't really know. 2. I really don't know.12br10For me, the second one is more emphatic - probably because the adverb is fronted and often stressed.02br
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10What's the difference in meaning between the above two sentences?12br
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