Задайте к предложениям специальные вопросы, начиная их с вопросительных слов, данных в скобках; 1. A teacher thinks of his pupils. (Who?)
2. My friend prepares his homework in the evening. (When?)
3. There is one mistake in your exercise, but a very bad one. (How many?)
4. You were speaking to your friend when I met you. (To whom?)