Examples: Ella conoce la biblioteca. - She knows the library. Yo conozco a la maestra. - I know the tutor. Tú conoces a ella. - You know her.
Hace diez años que conozco a Juan.- I've know John for ten years. Conozco a mi familia bien.-I know my family well. Conozco la ciudad de Punta Arenas en Chile.-I know the city of Punta Arenas in Chile. Conoces a tu gato porque hace buen rato que lo tenías.-You know your cat because you've had it for a while. Conoces al profesor nuevo?-Do you know the new profesor? Ella conoce a Bernardo y le caye bien.-She knows Bernardo, and she likes him. Raúl conoce Santiago porque vive allá-Raul know Santiago because he lives there. Debemos conocer la universidad juntos.-We should get to know the university together. La conocemos hace un mes.-We've known her a month. Le encanta el resturante italiano en el centro, lo conocéis.-She loves the Italian restaurant downtown, you all know it? Conocéis a vuestro perro tanto que lo dejáis solo en la casa?-Do you all know your dog so much that you leave him alone in the house? Ellos conocen a su madre bien entonces se comportan bien en el colegio.-They know their mother well so they behave in school. Ustedes conocen a mi padre.- You all know my father.
This only happens with "a" plus "el", not with "a" plus "la", "los", or "las". Especially not with "a" plus the pronoun "él"