素然止步

摘要： 主格代词：I , he , she , it , you , we我们 , they他/她们 I am a teacher. He is a teacher. You are teachers. 宾格代词：me , him他 , her 她, it它 , you , us我们 , them他/她们 阅读全文

摘要： Be动词的否定 在 am , is , are , was , were 后面加not. 缩写式：am not , isn’t , aren’t , wasn’t , weren’t 1. The man isn’t back. 主系表结构 2. I am not back. be动词根据主语决定时 阅读全文