Unit 5 This is my sister. Section A重点短语1. my two brothers 我的两个兄弟2. his sister 他的姐姐/ 妹妹 3. your friend 你的朋友经典句型1.This is my sister. 这是我的姐姐/ 妹妹。2. That is my brother. 那是我的哥哥 /弟弟。3. Is this your sister? No, it isn’t. 这是你的妹妹吗? 不,不是。4. Is that your brother? Yes, it is. 那是你的兄弟吗?是的,他是。5. These are my friends. 那是我的朋友们。6. Those are my two brothers. 那是我的两个兄弟。7. Is Guo Peng your brother? Yes, he is..