YOU SAID:

Tomorrow I had a school but I'm not going, because today raining.

INTO JAPANESE

明日は学校がありましたが、今日は雨が降っていたので行きません。

BACK INTO ENGLISH

There was a school tomorrow, but it's raining today so I won't go.

INTO JAPANESE

明日は学校がありましたが、今日は雨が降っているので行きません。

BACK INTO ENGLISH

There was a school tomorrow, but it's raining today so I won't go.