Be careful with grammar tenses.(The Past continuous and Past Simple)
1. When Peters mum(to Come)...... into his room, he (to watch)......the stars through the telescope.
2.I (to walk).......on the phone with Ann, when the films(to begin)

1When Peters mum came into his room,he was watching the stars through the telescope
2I was talking on the telephone with Ann,when the films began

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