Of all my teachers, Mr Smith is the one who impress me most. While he is in his 40s, he looks very young for his age. Compare with other teachers, he paid much attention to the way of teaching. He tries various way to make his classes lively and interested. In his opinion, we should not only know “what it is” , but to understand “why it is so”. He encourages us to think independently instead of giving us answer to a question immediate. Under his guidance, we've learned what to solve problems. He is so learned a person that we all admire her.