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We haven't rainedは✕です
動詞rainを使うと
It rains→It has rained→It hasn't rained
(現在形)→(現在完了形)→(現在完了形否定文)
名詞rainを使うと
We have rain→We have had rain→We haven't had rain
(現在形)→(現在完了形)→(現在完了形否定文)
We haven't had rain 〇
We haven't rained ✕
ということです😊
ありがとうございます🙏🙏
答えは
It hasn't rained since last week.
だとおもいます