Past Continuous

1. form

1.1. Positive

1.1.1. You were studying when she called

1.2. Negative

1.2.1. You weren't Studying when she called.

1.3. Question

1.3.1. Were you studying when she called ?

2. Uses

2.1. Interrupted Action in the Past.

2.1.1. Example

2.1.1.1. I was watching TV when she called.

2.2. Specific Time as an Interruption

2.2.1. Example

2.2.1.1. Last night at 6 PM, I was eating dinner.

2.3. Parallel Action

2.3.1. Example

2.3.1.1. I was studying while he was making dinner.