2. Раскройте скобки, употребляя глаголы в форме Past Simple или Past Continuous. 1. When my father (to come) home, I (to have) dinner. 2. When Alice (to return), I (to listen) to the radio. 3. When mother (to enter) his room, he (to draw) a picture. 4. When my sister (to come in), I (to do) my lessons. 5. When her aunt (to air) the room, she (to catch) cold. 6. When I (to meet) her, she (to go) to the office. 7. He (to wash) his face when somebody (to knock) at the door. 8. The young people (to dance) when I (to come) to the party. 9. When he (to wash) the dishes, he (to break) a plate. 10. What they (to do) when you (to see) them?

Правильные варианты:

1. When my father came home, I was having dinner.
   Когда мой отец пришёл домой, я обедал.

2. When Alice returned, I was listening to the radio.
   Когда Алиса вернулась, я слушал радио.

3. When mother entered his room, he was drawing a picture.
   Когда мама вошла в его комнату, он рисовал картину.

4. When my sister came in, I was doing my lessons.
   Когда моя сестра вошла, я делал уроки.

5. When her aunt was airing the room, she caught cold.
   Когда её тётя проветривала комнату, она простудилась.

6. When I met her, she was going to the office.
   Когда я встретил её, она шла в офис.

7. He was washing his face when somebody knocked at the door.
   Он умывался, когда кто-то постучал в дверь.

8. The young people were dancing when I came to the party.
   Молодые люди танцевали, когда я пришёл на вечеринку.

9. When he was washing the dishes, he broke a plate.
   Когда он мыл посуду, он разбил тарелку.

10. What were they doing when you saw them?
    Что они делали, когда ты их увидел?

Здесь Past Continuous употребляется для длительного действия в прошлом: was having, was listening, was drawing, were dancing.
Past Simple употребляется для короткого действия, которое произошло на фоне длительного: came, returned, entered, knocked, broke, saw.