YOU SAID:

i solemnly swear, i am up to no good.

INTO JAPANESE

私立探偵に後をつけさせた 彼が良くないのは知ってたよ

BACK INTO ENGLISH

I knew he was up to no good.

INTO JAPANESE

私立探偵に後をつけさせた 彼が良くないのは知ってたよ

BACK INTO ENGLISH

I knew he was up to no good.