A detective is a policeman but he does not wear a uniform. He works in his ordinary clothes. If he wears a uniform, robbers will kriow that he is a policeman, Then they will avoid him. To detect means 'to find out'. A detective finds out who does bad things. He can sit in a coffee-shop with other customers. He can listen to people talking. Some thieves may want to rob a shop. if they talk a detective may hear them. Then policemen will hide in the shop. When the thieves come, the policemen will catch them. A detective can go to a football match. He can watch for pickpockets and catch them: Pickpockets are people who steal things from people's pockets. A detective must be clever, honest and brave.He works hard and helps to protect us.