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1)Shelly hadn't seen her friends this day.
2) Had Selley spent the room at day?
3) What had happened to their house
Общий: Did Maxwell write his first scientific work when he was fifteen?
Альтернативный: Did Maxwell write his first scientific work when he was fifteen or twenty?
Разделительный: <span>Maxwell wrote his first scientific work when he was fifteen, didn't he?
К подлежащему: Who </span>wrote his first scientific work when he was fifteen?
к любому члену предложения: What did Maxwell write when he was fifteen?
Our Head teacher is going to make a new timetable, ..........<span> c) isn't he?</span>
Нужен сам текст чтобы ответить на вопросы.