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初中一年级英语上册 unit3 This is my siste

Unit 3 This is my sister. 单数变复数 this 变 these that 变 those he/she/it 变they is 变成are 名词后边加s:boy—boys girl___girls 你的我的他/她的都不变. 物主代词不与a/an并用。 e.g 1.This is my brother. These are my brothers. 
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