Saber vs Conocer (and Pedir vs Preguntar)

English is unusually relaxed about knowing. We use one verb for knowing a fact, knowing a person, knowing a city and knowing how to swim, and nobody minds. Spanish splits that job in two, and it splits asking in two as well, and both splits catch learners for years — not because the rules are complicated, but because English gives you no instinct to work from.

The distinctions are learnable in an afternoon. Making them automatic takes longer, but the afternoon is where it starts.

Saber: facts, information, skills

Saber is for information you hold — facts, details, and things you know how to do.

• No sé su nombre. — I don’t know his name.
• ¿Sabes dónde está la estación? — Do you know where the station is?
• Sé que llega tarde. — I know he’s arriving late.

The skills use is the one worth drilling, because English hides it inside a different word. Saber plus an infinitive means to know how to do something — and there is no cómo in it:

• Sé nadar. — I can swim / I know how to swim.
• No sabe conducir. — He can’t drive.

Sé cómo nadar is the sentence learners reach for, and it lands somewhere between odd and wrong. Drop the cómo.

Conocer: familiarity and acquaintance

Conocer is for things you are familiar with through experience — people, places, books, films, cities. It is closer to to be acquainted with than to to know.

• Conozco a María. — I know María.
• ¿Conoces Valencia? — Do you know Valencia? (Have you been?)
• No conozco esa canción. — I don’t know that song.

Note the a before a person — the personal a is obligatory here and its absence is one of the most audible learner errors in the language.

The clean test: if you could sensibly replace the English with I’m familiar with, it is conocer. If you could replace it with I have the information that, it is saber. Consider the pair:

• Sé dónde está Sevilla. — I know where Seville is. I have the fact; I may never have been.
• Conozco Sevilla. — I know Seville. I have walked around it.

What happens in the preterite

Both verbs shift meaning in the preterite, and this catches people who thought they had it sorted. In the past, they stop describing a state and start describing the moment the state began.

• Supe la verdad ayer. — I found out the truth yesterday. Not I knew, but I learned.
• Conocí a Marta en 2019. — I met Marta in 2019. The moment of first acquaintance.

For the ongoing state, the imperfect does the work: sabía la verdad, I knew the truth; conocía a Marta, I knew Marta.