Поставьте следующие предложения в отрицательную и вопросительную форму .
1) He opened the window before classes. 2) Ann translated a lot of foreign letters at the office last week. 3) I finished work at five o'clock the day before yesterday. 4)He lived in Omsk five years ago.5) They returned home in the evening. 6) They discussed a lot of articles from these French magazines last weekend. помогите прошу