In the imperfect there is only three irregular verbs: ir («walk»), ser («be and ver («see»). You should memorize these three irregular verbs. Since there are only three verbs, it shouldn’t be too difficult to remember them. The following table shows you how to conjugate these irregular verbs.
Use of the Imperfecto Spanish
In which situations in the past you can use the tense Pretérito Imperfecto de Indicativo, you will find out below:
Parallel actions in the past
The imperfecto can be used when two actions at the same time have occurred in the past. So while one plot was going on, a new plot started.
Mientras desayunaba, sonaba mi teléfono.(While I was having breakfast, my phone rang.)
Escuchaba musica, mientras estudiaba para el examen.(I was listening to music while studying for the exam.)
Trabayaba mientras todos dormian.
(I worked while everyone else slept.)
Habitual actions in the past
With the imperfecto you can habitual actions or, to put it another way, describe a routine. So you can use the imperfecto to describe that, for example, you used to go jogging every day or baked cookies every day.
Todos los dias comía Pizza.
(I ate pizza every day.)
Cuando era joven, jugaba muchos juegos de ordenador.(I played a lot of computer games when I was young.)
En Navidad, veiamos películas navideñas.(On Christmas we watched Christmas movies.)
States and descriptions in the past
You can also use the imperfecto if you Describe people or situations in the past want. Maybe you want to describe the weather or a friend at the time. You can express all of this with the imperfecto.
Cuando era joven, salía con amigos.(I used to go out with friends when I was young.)
Cuando tenia 15 years, tenia el pelo largo y negro. (I had long, black hair when I was 15.)