knows what he/she is doing
He doesn't know what he's doing.
Tom sabe lo que está haciendo.
Tom knows what he's doing.
Tom no sabe lo que está haciendo.
Tom doesn't know what he's doing.
Tom sabe lo que está haciendo, ¿verdad?
Tom knows what he's doing, right?
Tom no sabe lo que está haciendo, ¿verdad?
Tom doesn't know what he's doing, does he?
Tom es joven, pero sabe lo que está haciendo.
Tom is young, but he knows what he’s doing.
Creo que Tom sabe lo que está haciendo.
I think Tom knows what he's doing.
Papá sabe lo que está haciendo.
Dad knows what he’s doing.