1. They left before he returned from university.

2. The work was not completed by September.

3. He said that he had already translated the text.

4. Students stopped talking when the teacher started the lecture.

5. A friend asked if the lesson was interesting.

6. Irina replied that she liked the lesson.

7. We read several books about Tchaikovsky before we went to Klin.

8. Did they finish work by five o'clock?

9. He said that he had prepared well for the exams.

10. She returned the dictionary to me after she translated the text.

11. Did he learn to speak French by the end of the year?