Hi friends, I was reading Unit 13 of English Grammar In Use-Raymond Murphy and I got confused with one line. "Do not use the present perfect if the situation now is different" I didn't understand the meaning of this line, there were some examples explaining it Example 1 ->They've gone away. They'll be back on friday. (they are away now) ->They went away, but I think they're back at home now. (not they've gone) Example 2 ->It has stopped raining now, so we don't need the umbrella. (it isn't raining now) ->It stopped raining for a while, but now it's raining again. (not it has stopped) Please tell me how the situation now is different in the second sentence of the above two examples.
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