YOU SAID:
Hello! I'm not sure what this is
INTO JAPANESE
こんにちは!私はこれが何であるかわからない
BACK INTO ENGLISH
Hello! I do not know what this is
INTO JAPANESE
こんにちは!私はこれが何であるかわかりません
BACK INTO ENGLISH
Hello! I do not know what this is
That didn't even make that much sense in English.