they don't know
They don't know.
They don't know anything.
— Das weiße Band - Eine deutsche Kindergeschichte (2009)
Ellos no saben la fecha de su boda.
They don't know the date of their wedding.
Ellos no saben que soy japonés.
They don't know that I'm Japanese.
Ellos no saben lo que es una olla a presión.
They don't know what a pressure cooker is.
— Queen (2014)
I know something they don't know.
They don't know my name.