Examples:
¿Me veía? - Were you seeing me? Te oía. - I was hearing you. Lo conocía. - I used to know him. or I knew you. Lo conocía a él. - I used to know him. Lo conocía a usted. - I used to know you. Yo me miraba en el espejo. - I was looking 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)
Leía el periódico. - I was reading the newspaper. Lo leía. - I was reading it.
Ella compraba pollo. - She was buying chicken. Ella lo compraba. - She was buying it.
Veía a los niños. - I was watching the children. Los veía. - I was watching them.
Buscaba mi libro. - I was looking for my book. Lo buscaba. - I was looking for it.
El señor compraba una mesa. - The gentleman was buying a table. El señor la compraba. - The gentleman was buying it.
La niña vendía limonada. - The girl was selling lemonade. La niña la vendía. - The girl was selling it.
Elena daba una contribución. - Elena was giving a contribution. Elena la daba. - Elena was giving it.
Juan comía un burrito. - Juan was eating a burrito. Juan lo comía. - Juan was eating it.
Rosa cocinaba puerco. - Rosa was cooking pork. Rosa lo cocinaba. - Rosa was cooking it.
Mis primas no lo conocían a Juan. - My cousins didn't used to know Juan. Mis primas no lo conocían. - My cousins didn't used to know him.
Mis hermanos conocían a mis amigos. - My brothers used to know my friends. Mis hermanos los conocían. - My brothers used to know them.
Nosotros veíamos a los muchachos. - We were watching the boys. Nosotros los veíamos. - We were watching them.
Ellos querían dar un regalo. - They wanted to give a gift. Ellos lo querían dar. - They wanted to give it.
Carlos mataba al tigre. - Carlos was killing the tiger. Carlos lo mataba. - Carlos was killing it.
Isabel brincaba la cuerda. - Isabel was jumping the rope. Isabel la brincaba. - Isabel was jumping it.
Tú visitabas a Elena. - You were visiting Elena. Tú la visitabas. - You were visiting her.
Tus padres visitaban a Juan. - Your parents were visiting Juan. Tus padres lo visitaban. - Your parents were visiting him.
Yo oía a mis hermanas en la casa. - I was hearing my sisters in the house. Yo las oía en la casa. - I was hearing them in the house.