[Ask ] what's the difference
1. what's the difference between
"what's happening" and "what happened"
2. should be used under what kind of circumstances
thx
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04/03 13:58, , 1F
04/03 13:58, 1F
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04/03 13:59, , 2F
04/03 13:59, 2F
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04/03 13:59, 3F
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04/05 01:20, , 8F
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04/05 01:21, , 9F
04/05 01:21, 9F