Uses & key words of preterite vs imperfect

frecuentemente

• Imperfect

• Present

• Future

• Conditional

antenoche

• the night before last

• the night after last

• the night before yesterday

• the night after tomorrow

La semana pasada

• Preterite

• Imperfect

• Future

• Present

used to / would

• perfect

• imperfect

• simple

• progressive

El viernes

• Preterite

• Imperfect

• Future

• Conditional

Usualmente

• Imperfect

• Present

• Future

• Conditional

varias veces

• several times

• many times

• few times

• once

an action interrupts an ongoing action

• cuando

• mientras

• después

• antes

a veces

• always

• sometimes

• never

• rarely

a menudo

• Imperfect

• Perfect

• Simple Past

• Future