As
At that moment
In 2010
Ongoing actions in the past
Setting the scene
Completed actions
Sequential actions
Negative: did not + base form
All day
Used for actions in progress
Regular verbs + -ed
Past facts
Specific time references
Negative: was/were not + verb + -ing
Last week
Interrupted actions
When I was a child
Was/Were + verb + -ing
Two days ago
Setting the scene
Questions: Was/Were + subject + verb + -ing?
Affirmative: subject + was/were + verb + -ing
Simultaneous actions
Irregular verbs (specific forms)
Background actions
While
Affirmative: subject + past form
Ongoing actions in the past
When
Questions: Did + subject + base form?
Background actions
Habits in the past
Yesterday
Interrupted actions
Simultaneous actions