Дам 30 баллов помогите с английским! Make negative sentences and questions 1. I should have posted that letter yesterday itself,but I forgot. 2. She should have knocked at the door before entering the room. 3. The should have i...

Дам 30 баллов помогите с английским! Make negative sentences and questions 1. I should have posted that letter yesterday itself,but I forgot. 2. She should have knocked at the door before entering the room. 3. The should have informed his parents that he was unwell. 4. He should have worked harder. 5. He should have obtained the necessary permissions before opening the shop