We use different past tenses to focus on different moments and periods of time in the past. The tense we use depends on whether the action or event is a past habit or state, whether it is completed, the duration of an action or event, and the order we use to recall the action or events.
Look at the diagram:
When Andrea arrived home at 8:00 last night
5:00 6:00 7:00 8:00 9:00
___________
.......................
____________ Tim cooked dinner
....................... Tim was cooking dinner
Tim had cooked dinner
Look at the diagram:
When Andrea arrived home at 8:00 last night
5:00 6:00 7:00 8:00 9:00
___________
.......................
____________ Tim cooked dinner
....................... Tim was cooking dinner
Tim had cooked dinner
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