Exercise 2: Choose the correct verb forms. Use simple past or the past continuous tense:
1. We (sit) at the breakfast table when the doorbell (ring)
2. The students (play) cards when the teacher (come) in.
3.It (start) to rain while she (water) the flowers in her garden.
4. When I (open) the door, it (rain)
were sittting
rang
were playing
came
started
was watering
opened
was raining