摘要：
一、already / just / yet Already and yet are usually used with the present perfect tense, but in NAmE they can also be used with the simple past tense. 阅读全文
摘要：
目录 一、 About -- Saying what a text is about 描述文章的内容 二、 According to -- Reporting someone's opinion 陈述某人的观点 三、 Addition -- Adding another item 补充说明 四、 A 阅读全文