Examples:
¿Me ves? - Do you see me? Te oigo. - I hear you. Lo conozco. - I know him. or I know you. Lo conozco a él. - I know him. Lo conozco a usted. - I know you. Yo me miro en el espejo. - I look at myself in the mirror.
me - me (singular)
te - you (singular)
lo - him, you, it (singular)
la - her, you, it (singular)
nos - us (plural)
os - you, familiar (plural)
los - them, you (plural)
las - them, you (plural)
Lees el periódico. - You read the newspaper. Lo lees. - You read it.
Ella compra pollo. - She buys chicken. Ella lo compra. - She buys it.
Veo a los niños. - I see the children. Los veo. - I see them.
Busco mi libro. - I look for my book. Lo busco. - I look for it.
El señor compra una mesa. - The gentleman buys a table. El señor la compra. - The gentleman buys it.
La niña vende limonada. - The girl sells limeade. La niña la vende. - She sells it.
Elena da una contribución. - Elena gives a contribution. Elena la da. - Elena gives it.
Juan come un burrito. - Juan eats a burrito. Juan lo come. - Juan eats it.
Rosa cocina puerco. - Rosa cooks pork. Rosa lo cocina. - Rosa cooks it.
Mis primas no conocen a Juan. - My cousins don't know Juan. Mis primas no lo conocen. - My cousins don't know him.
Mis hermanos conocen a mis amigos. - My brothers know my friends. Mis hermanos los conocen. - My brothers know them.
Nosotros vemos a los muchachos. - We see the boys. Nosotros los vemos. - We see them.
Ellos quieren dar un regalo. - They want to give a gift. Ellos lo quieren dar. - They want to give it.
Carlos mata a Juan. - Carlos kills Juan. Carlos lo mata. - Carlos kills him.
Isabel salta a la cuerda. - Isabel jumps the rope. Isabel la salta. - Isabel jumps it.
Tú visitas a Elena. - You visit Elena. Tú la visitas. - You visit her.
Tus padres visitan a Juan. - Your parents visit Juan. Tus padres lo visitan. - Your parents visit him.
Yo oigo a mis hermanas en la casa. - I hear my sisters in the house. Yo las oigo en la casa. - I hear them.