The imperfect is used to talk about what you used to do or what you were like in the past and about actions that continued for an unspecified amount of time.
Cuando yo era joven, tenía muchos novios. When I was young, I used to have many boyfriends.
The verb tener (to have) is regular in the imperfect tense.
The imperfect tense endings are: ía íamos ías íais ía ían
Cuando era niño tenía que comer verduras. - When I was a child I used to have to eat vegetables. Mi primer carro no tenía radio. - My first car didn't have a radio. Mi hermana tenía solo dos libros cuando era niña. - My sister used to have only two books when she was a little girl. Ella tenía mucho dinero, pero lo perdió en un mal negocio. - She used to have a lot of money, but she lost it in a bad transaction. Juan tenía cuatro gatos cuando vivía en la granja. - Juan used to have 4 cats when he was living in the farm. Tú tenías malas notas cuando estabas en la universidad. - You used to have bad grades when you were in college. Nosotros teníamos un buen empleo cuando vivíamos en Madrid. - We used to have a good job when we lived in Madrid. Ellos tenían una mala reacción al agua. - They were having a bad reaction to the water.