Поставьте в отрицательную и вопросительную форму: 1. he opened the window before classes. 2. they discussed a lot of articles in this office. 3. She knew about her new dress. 4. They were at home yesterday evening. 5. He was there yesterday

1) he did not open the window before classes. Is he opened the window before school? 2) they have not discussed many articles in this office. We are discussing whether they are many articles in this office? 3) She did not know about her new dress. Did she know about my new dress? 4) They were not home last night. Were they at home last night? 5) It was not there yesterday. Was he there last night?