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1 -: He didn't open the window before classes.

1 ?: Did he open the window before classes?

2 -: Ann didn't translate a lot of foreign letters at the office last week.

2 ?: Did Ann translate a lot of foreign letters at the office last week?

3 -: I didn't finish work at five o'clock the day before yesterday

3 ?: Did i finish work at five o'clock the day before yesterday?

4 -: He didn't live in Kiev five years ago.

4 ?: Did he live in Kiev five years ago

5 -: They didn't return home in the evening

5 ?: Did they return home in the evening?

6 -: They didn't discuss a lot of articles from these French magazines last week-end

6 ?: Did they discuss a lot of articles from these French magazines last week-end?