ellos no saben

they don't know

→ él
phrase Common #9,544
they don't know Ellos refers to a group of people and is often omitted when the context makes clear who is meant.
SP: Ellos no saben dónde está la estación.
EN: They don't know where the station is.

Ellos no saben dónde estoy.

They don't know where I am.

— Happy together (1997)

Ellos no saben.

They don't know.

Ellos no saben nada.

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)

Ellos no saben, no piensan.

They don't know, they don't think.

— गल्ली बॉय (2019)

Sé algo que ellos no saben.

I know something they don't know.

Ellos no saben mi nombre.

They don't know my name.