To be plain with you, I know nothing about it.

坦白对你讲, 我对此一无所知.

辞典例句

To be plain with you, we don't consider your work entirely satisfactory.

老实告诉你, 我们认为你的工作并不十分令人满意.

互联网

To be plain with you, we do not consider your work entirely satisfactory.

老实告诉你, 我认为你的工作并不完全令人满意.

互联网