原稿：
When we went outside to run today, I suddenly found the ground was wet, maybe rain has came. I asked my classmates about if they noticed the rain, and they didn't notice it too. Sometimes things are like that, it happens, and we don't notice it at all.
Correctly:
When we went outside to run today, I suddenly found the ground was wet. Maybe rain had come. I asked my classmates if they noticed the rain, and they didn't see it too. Some things are just like the rain, it appears, and we don't notice it.
（就知道我不该用过去完成时。）
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