saber lo que

to know what

→ saber
phrase Extremely common #347
to know what Usually followed by a verb or clause indicating what someone knows. The verb saber is conjugated according to the subject.
SP: Tienes que saber lo que estás haciendo.
EN: You have to know what you are doing.

No puedes culparla por no saber lo que no le han enseñado.

You can't blame her for not knowing what she hasn't been taught.

Pero mi jefe necesita saber lo que sabemos ahora.

But my boss needs to know what we know now.

Me gustará saber lo que les has soltado como excusa.

I'd like to know what excuse you gave them.

— Los 400 golpes (1959)

Es mi trabajo saber lo que estás pensando.

It's my job to know what you're thinking.

A tu edad deberías saber lo que es mejor.

At your age you should know what's best.

No quiero saber lo que hay allí dentro.

I don't want to know what's inside.

Yo necesito saber lo que Ud. sabe.

I need to know what you know.

Tenemos que comprar los periódicos para saber lo que ocurre.

We have to buy the newspapers to find out what's going on.

¿No querés saber lo que Tom realmente piensa de vos?

Don't you want to know what Tom really thinks of you?

Es mi trabajo saber lo que usted está pensando.

It's my job to know what you're thinking.

¡Van a saber lo que es la Justicia, hijos de puta!

You’re going to find out what justice is, you sons of bitches!

— El secreto de sus ojos (2009)

Mejor conocerse, que saber lo que uno hace.

It is better to know yourself than to know what you are doing.

Tienes el lujo de no saber lo que yo sé.

You have the luxury of not knowing what I know.

— Cuestión De Honor (1992)

Te alegrará saber lo que creo.

You'll be glad to know what I think.

— Psicosis (1960)

Creo saber lo que es.

I think I know what it is.

¿Por qué querés saber lo que estoy pensando?

Why do you want to know what I’m thinking?

¿O saber lo que hace que los árboles crezcan?

Or knowing what makes trees grow?

— El espíritu de la colmena (1973)

¿Podremos saber lo que están pensando?

Will we be able to know what they're thinking?

— 8½ (1963)