The police began to look for the thief.
1. Общий вопрос. Did the police begin to look for the thief?
2. Специальный вопрос. When did the police begin to look for the thief?
3. Альтернативный вопрос. Did the police begin to look for the thief or for the victim?
4. Разделительный вопрос. The police began to look for the thief, didn`t they?
5. Вопрос к подлежащему. Who began to look for the thief?