英语七年级上册第三单元重点内容,比如介绍自己的家人,they,is,are的什么复数单数

Unit3.This is my sister.
句型：1,Is this your sister?No,it isn’t.
Is she your sister?No,she isn’t.
2,This is my friend.
These are my friends.
That is my brother.
Those are my brothers.
3,Thanks for the photo of your family.Here is my family photo.
photo of your family = your family photo
语法：可数名词单数变复数：一般情况下加s,book-books,以s,x,sh,ch结尾的加es
watch-watches 以辅音字母加y结尾的,把y改为i再加es boy- boys,family-families 以o结尾的有生命的加es,无生命的加s,tomato-tomatoes,photo-photos
Unit3 This is my sister.
　　一、短语
　　1.thanks for (sth/doing sth)
　　2.pen friend/pal
　　3.family photo
　　4.take a photo
　　二、句型/语法点
　　1.Is he your friend?
　　2.This/That is my sister.
　　These/Those are my brothers.