YOU SAID:
They don’t know who my senpai is it’s not who you think
INTO JAPANESE
彼らは私の先輩が誰なのか知りません、あなたが思っているような人ではありません
BACK INTO ENGLISH
They don't know who my senior is, he's not what you think
INTO JAPANESE
彼らは私の先輩が誰なのか知りません、彼はあなたが思っているような人ではありません
BACK INTO ENGLISH
They don't know who my senior is, he's not who you think he is
INTO JAPANESE
彼らは私の先輩が誰であるかを知りません、彼はあなたが思っているような人ではありません
BACK INTO ENGLISH
They don't know who my senior is, he's not who you think he is
That didn't even make that much sense in English.