YOU SAID:

tomorrow we go to school but on wednesday we don't because it's flag day and on thursday we go to the gym

INTO JAPANESE

明日は学校に行きますが、水曜日は旗の日であり、木曜日はジムに行くので

BACK INTO ENGLISH

I will go to school tomorrow, but since Wednesday is the day of the flag, I go to the gym on Thursday

INTO JAPANESE

私は明日学校に行きますが、水曜日が旗の日なので、木曜日にジムに行きます

BACK INTO ENGLISH

I will go to school tomorrow, but since Wednesday is a flag day, I will go to the gym on Thursday

INTO JAPANESE

私は明日学校に行きますが、水曜日はフラッグの日なので、木曜日にジムに行きます

BACK INTO ENGLISH

I will go to school tomorrow, but since Wednesday is a flag day, I will go to the gym on Thursday