Поставьте следующие предложения в отрицательную и вопростельную формы. He opened the window before classes. Ann translated a lot of foreign letters at the office last week. I finished work at five o'clock the day before yesterday. He lived in Omsk five years ago. They returned home in the evening. They discussed a lot of articles from these French magazines last weekend.

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Отрицательная форма:
He did not open the window before classes.
Ann did not translate a lot of foreign letters at the office last week.
I did not finish work at five o'clock the day before yesterday.
He did not live in Omsk five years ago.
They did not return home in the evening.
They did not discuss a lot of articles from these French magazines last weekend.

Вопросительная форма:
Did he open the window before classes?
Did Ann translate a lot of foreign letters at the office last week?
Did I finish work at five o'clock the day before yesterday?
Did he live in Omsk five years ago?
Did they return home in the evening?
Did they discuss a lot of articles from these French magazines last weekend?