Simple or Continuous
I ____ (watch) television when he arrived.
PAST CONTINUOUS (was watching)
To understand...
understood
I swim in the pool every day.
I SWAM in the pool every day.
They eated pizza yesterday.
They ATE pizza yesterday.
I was watching a movie when I ____ (notice) him standing outside.
PAST SIMPLE (noticed)
To buy...
bought
The chef cleans his kitchen.
The chef CLEANED his kitchen.
They was taking an exam when the bell rang.
They WERE taking an exam when the bell rang.
I _____ (see) a celebrity when I was shopping yesterday.
PAST SIMPLE (saw)
To know...
knew
The caterpillar becomes a butterfly.
The caterpillar BECAME a butterfly.
I graduaded from university last year.
I graduaTed from university last year.
She arrived when I _____ (have) a bath so I couldn't answer the door.
PAST CONTINUOUS (was having)
To bring...
BROUGHT
I don't know the answer.
I DIDN'T know the answer.
I slept when suddenly the doorbell rang.
I WAS SLEEPING when suddenly the doorbell rang.
I _____ (sit) in a cafe when you _____ (call).
I (WAS SITTING) in a cafe when you (CALLED).
To mean...
meant
I cough when there is smoke in the room.
I COUGHED when there WAS smoke in the room.
They was running to school this morning when I see them.
They were running to school this morning when I saw them.