YOU SAID:

I find it quite boring when there is nothing to do

INTO JAPANESE

何もすることがないときはとても退屈だと思う

BACK INTO ENGLISH

I feel so bored when I have nothing to do

INTO JAPANESE

何もすることがないとき、私はとても退屈に感じる

BACK INTO ENGLISH

I feel so bored when I have nothing to do