YOU SAID:

Im bored i should be in school

INTO JAPANESE

私は学校にいる必要があります退屈

BACK INTO ENGLISH

bored i must be at school

INTO JAPANESE

退屈な私は学校にいるに違いない

BACK INTO ENGLISH

I must be in school because I'm bored.

INTO JAPANESE

私は退屈なので、私は学校にいるに違いない。

BACK INTO ENGLISH

I must be in school because I'm bored.