YOU SAID:
hi oh hi i dont know that you was here
INTO JAPANESE
こんにちは私はあなたがここにいることを知っていません
BACK INTO ENGLISH
Hello I do not know you are here
INTO JAPANESE
こんにちは私はあなたがここにいるのを知らない
BACK INTO ENGLISH
Hello I do not know you are here
You've done this before, haven't you.