Hey, don't be sad, mainly because the teacher in the library is not responsible. Students will definitely want to give it to the teacher when they find the lost property. How can a teacher talk like this and pass the buck? Don't be sad. At first, your intention was good, because the phone was turned off without power, and you didn't think it was caused. Besides, why curse the master when it rains? You didn't steal it, and you didn't mean not to return it to him. Swearing is wrong. You should explain to the shopkeeper.