PAST CONTINUOUS

1. FROM

1.1. affirmative

1.1.1. They were eating when he called.

1.2. negative

1.2.1. they weren"t eating when he called.

1.3. interrogative

1.3.1. were they eating when he called?

2. uses

2.1. interrupted action in the past.

2.2. specific time as an interruption

2.3. parallel actions