YOU SAID:
i knew u were trouble when u walked in
INTO JAPANESE
私はあなたが入ったときにあなたが困っていることを知っていました
BACK INTO ENGLISH
I knew you were in trouble when you entered
INTO JAPANESE
あなたが入ったときあなたが困っていることを私は知っていました
BACK INTO ENGLISH
I knew you were in trouble when you entered
You've done this before, haven't you.