YOU SAID:

There must be a reason why school is so boring because it is just too boring and i dont know why

INTO JAPANESE

学校がこんなに退屈なのは何か理由があるに違いない、なぜならあまりにも退屈だからだ、なぜだかわからない

BACK INTO ENGLISH

There must be a reason why school is so boring, because it's so boring, I don't know why.

INTO JAPANESE

学校がこんなにつまらないのには何か理由があるはずだ、なぜだかわからないが、とても退屈だからだ。

BACK INTO ENGLISH

There has to be a reason why school is so boring, I don't know why, but it's because it's so boring.

INTO JAPANESE

学校がこんなにつまらないのには何か理由があるはずだ、理由は分からないが、それはとても退屈だからだ。

BACK INTO ENGLISH

There has to be a reason why school is so boring, I don't know why, but it's because it's so boring.