YOU SAID:

I have to study but im bored

INTO JAPANESE

私は勉強しなければなりませんが、退屈しています

BACK INTO ENGLISH

I have to study but I'm bored

INTO JAPANESE

勉強しなきゃいけないけど退屈

BACK INTO ENGLISH

I have to study but it's boring

INTO JAPANESE

勉強しなきゃいけないけどつまらない

BACK INTO ENGLISH

I have to study but it's boring