1. Our engineers (was, were) at the factory yesterday. 2. When (was, were) you a student? 3. Our children (was, were)

1. Our engineers were at the factory yesterday. 2. When were you a student? 3. Our children were not at school yesterday. It was Sunday. 4. Who was your English teacher at school? Mr. Sedov was. 5. My friends were in Kiev three years ago. 6. Where was Mr. Petrov at 9 o\'clock yesterday? 7. My friend was not at his office last week. He was not well. 8. Who was at the lesson yesterday? They were.