1. The book will be discussed at the next conference.
2. Yesterday he was told to prepare a speech.
3. The lecture was attended by all of us yesterday.
4. A taxi was called fifteen minutes ago, so we are expecting it any moment.
5. The young man was introduced to me only a couple of hours ago, but it seems to me that I've known him for years.
6. The mobile phone mustn’t be used at the lesson.