To me it is very well still raining. I suggest that your uncertainty is because #2 does not supply the context that #1 does: 2a-- It's been raining since late last night. (and it is presumably continuing now) 2b-- It's been raining on and off for days.
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Ant_222 ...your explanation through active and passive attributes. I don't know why you need this classification. Maybe it's correct, but I don't like it.Hi, Ant_222.