3. Circle the correct alternative. If when or while are both possible, circle both. 1) The shop assistant was talking to a customer when / while a police officer entered the shop. 2) I started to feel ill when / while I was waiting to see the dentist. 3) They were visiting an art exhibition when / while they saw a famous actor. 4) Were you listening to classical music when / while I came to your house? 5) Did you see all the firefighters when / while you were walking to school?

Перевод задания: Обведите правильный вариант. Если подходят и when, и while, обведите оба.

1. The shop assistant was talking to a customer when a police officer entered the shop. (Продавец разговаривал с покупателем, когда в магазин вошёл полицейский.)
2. I started to feel ill while I was waiting to see the dentist. (Я начал(а) плохо себя чувствовать, пока ждал(а) приёма у стоматолога.)
3. They were visiting an art exhibition when they saw a famous actor. (Они осматривали художественную выставку, когда увидели известного актёра.)
4. Were you listening to classical music when / while I came to your house? (Ты слушал(а) классическую музыку, когда я пришёл(пришла) к тебе?)
5. Did you see all the firefighters when / while you were walking to school? (Ты видел(а) всех пожарных, когда шёл(шла) в школу?)

Пояснение: When обычно вводит короткое событие, прерывающее длительное действие; while подчёркивает действие, происходившее в течение некоторого времени. В предложениях 4 и 5 допустимы оба союза.