B. Use the Past Continuous Tense

Model: He worked hard, (when I came)

- He was working hard when I came.

1. He delivered lectures every week, (at 12 o'clock yesterday) 2. He worked in the library yesterday, (from 3 till 5 o'clock) 3. He left the house, (when the bell rang) 4. He crossed the street, (when I saw him) 5. The children played in the yard, (from 10 till 12 o'clock)