Uses & key words of preterite vs imperfect

una vez

• Perfect

• Imperfect

• Simple Past

• Future

antenoche

• the night before last

• the night after last

• the night before yesterday

• the night of yesterday

specific details to a story

• preterite

• imperfect

• future

• conditional

age

• imperfect

• perfect

• ancient

• modern

action has no specific beginning or end

• perfect

• imperfect

• complete

• finite

a menudo

• Perfecto

• Imperfect

• Futuro

• Condicional

siempre

• always

• never

• sometimes

• often

was ___-ing

• perfect

• imperfect

• simple

• progressive

continual, repetitive, habitual

• imperfect

• perfect

• occasional

• temporary

2 simultaneous actions occurring

• mientras

• después

• antes

• luego