YOU SAID:

my cat is real annoying when im doing work

INTO JAPANESE

仕事をしているとき、私の猫は本当に迷惑です

BACK INTO ENGLISH

My cat is really annoying when I am working.

INTO JAPANESE

私の猫は、私が働いているとき、本当に迷惑です。

BACK INTO ENGLISH

My cat is really annoying when I am working.