Vocabulario
El pretérito
Pretérito o imperfecto
Pretérito o imperfecto
El imperfecto
100

desayuno, almuerzo, cena

breakfast, lunch, dinner

100

tú llegar

llegaste

100

cuando era niño

Imperfecto (when I was a child, repeated)

100

Action or events that are not usually repeated like graduating or dying or being born

preterite

100

ir yo

iba

200

tentempié

snack
200

yo poder

pude

200

una vez

pretérito (it happened once, over and done with)

200
series of completed events in the past

preterite

200

despertarse

me despertaba

300

probarse

to try on 

300

yo caerse

me caí

300

El fin de semana pasado

pretérito (specific moment in the past)

300

telling the time and age in the past

imperfect

300

ser yo

era

400

alimentación

food

400

tú ir

fuiste

400

Todos los inviernos

Imperfecto (repeated in the past, habitual)

400

mental states or mental actions (thinking, liking etc) in the past

imperfecto

400

yo jugar

jugaba

500

la limpieza

the cleaning

500

ella hacerse

se hizo

500

un verano

Pretérito (one specific summer, you did something)

500

Ongoing actions in past without clear beginning or ending

imperfecto 

500

gustar yo (vegetales)

me gustaban