Past Continous

USE 1 Interrupted Action in the Past

Use the Past Continuous to indicate that a longer action in the past was interrupted. The interruption is usually a shorter action in the Simple Past. Rememberthis can be a real interruption or just an interruption in time.
Examples:
* I was watching TV when she called.
* When the phone rang, she was writing a letter.
* While we werehaving the picnic, it started to rain.
* What were you doing when the earthquake started?
* I was listening to my iPod, so I didn't hear the fire alarm.
* You were not listening to me when I toldyou to turn the oven off.
* While John was sleeping last night, someone stole his car.
* Sammy was waiting for us when we got off the plane.
* While I was writing the email, the computersuddenly went off.
* A: What were you doing when you broke your leg?
B: I was snowboarding.
USE 2 Specific Time as an Interruption

In USE 1, described above, the Past Continuous is interruptedby a shorter action in the Simple Past. However, you can also use a specific time as an interruption.
Examples:
* Last night at 6 PM, I was eating dinner.
* At midnight,we were still driving through the desert.
* Yesterday at this time, I was sitting at my desk at work.

IMPORTANT
In the Simple Past, a specific time is used to show when an action began or finished. In the PastContinuous, a specific time only interrupts the action.
USE 3 Parallel Actions

When you use the Past Continuous with two actions in the same sentence, it expresses the idea that both actions werehappening at the same time. The actions are parallel.
Examples:
* I was studying while he was making dinner.
* While Ellen was reading, Tim was watching television.
* Were you listening whilehe was talking?
* I wasn't paying attention while I was writing the letter, so I made several mistakes.
* What were you doing while you were waiting?
* Thomas wasn't working, and...