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Ответ:
- Phil came across a photo of his great-grandfather as he was looking through some old things. — Краткое событие произошло на фоне продолжительного действия.
- While Sara was doing her homework, her brother was playing music loudly, and she couldn’t concentrate. — Два действия происходили одновременно.
- Mark had been trying to find a present for his mum for over an hour before she finally saw something nice to buy her. — Длительное действие предшествовало другому событию в прошлом.
- Kate was exhausted because she had been jogging for two hours. — Длительное действие до момента в прошлом объясняет состояние.
- Julia performed really well yesterday; she had been practising for months before the recital. — Выступление произошло в прошлом; подготовка продолжалась до него.
