Unit2 This is my sister.1. parent: father or mother 父亲或母亲 parents: father and mother父母（双）亲2. 介绍他人1) This / That is.这那位是.2)These / Those are.这那些是.This is my friend Jane.这（位）是我的朋友简That is my grandfather. 那(位)是我的祖父。These are my brothers. 这些是我的兄弟。Those are my parents. 那些是我的父母。3. 指示代词this / these 这/这些。一般用来指时间或空间上较近的事物。that / those 那/那些。一般用来指时间或空间上较远的事物。4. This is my friend. 复数：These are my friends.That is my brother. 复数：Those are my brothers.5. Whos s
