YOU SAID:

i sometimes always have to go to the loo when i need to go potty on the john

INTO JAPANESE

私は時々ジョンのトイレに行く必要があるときにルーに行かなければならない

BACK INTO ENGLISH

I have to go to Lou when I sometimes have to go to John's bathroom.

INTO JAPANESE

私は時々ジョンのトイレに行かなければならないとき、私はルーに行かなければなりません。

BACK INTO ENGLISH

I have to go to Lou when I have to go to John's bathroom from time to time.

INTO JAPANESE

私は時々ジョンのトイレに行かなければならないとき、私はルーに行かなければなりません。

BACK INTO ENGLISH

I have to go to Lou when I have to go to John's bathroom from time to time.