YOU SAID:
i have misplaced my pants
INTO JAPANESE
私は私のズボンを間違って配置している
BACK INTO ENGLISH
I have placed my pants by mistake
INTO JAPANESE
私は誤ってズボンを着てしまった
BACK INTO ENGLISH
I accidentally put on my pants
INTO JAPANESE
私は誤ってズボンを着ました
BACK INTO ENGLISH
I accidentally put on my pants
You've done this before, haven't you.