Unit 2,This is my sister,Section A (2a-2d,family,grandfather, grandmother (grandparents,father, mother (parents,brother (son), sister (daughter,Talk about this family,This is my father,This is my mother,These are my parents,Im Mary,This is my grandfather,This is my grandmother,These are my grandparents,单数 复数 this (这个) these(这些) that (那个) those(那些) it/he/she(它、他、她)they (他们) is (是) are(是,注意到了吗,This _ my sister. That _ his brother. She _ his aunt. He _ my uncle . These _ her parent