一、as well常用作状语，表示“又，也”。书面语中常用语句末，在口语表达中可用于句中。例如：I not only play the guitar, I sing as well./You may as well go. 。 as well as 1. 用来连接两个并列成分，表示“也，还”，但是其谓语项要与该短语前面的一项保持一致。（区别not only...but also要与后一项保持一致。）例：My sister as well as I is a good teacher./ Not only my sister but also I am a good teacher. 2. 同级比较，“一样好”。例：You look as well as you did five years ago. 二、So did she是倒装结构，表示“...她也一样。”是不同的两个主语。例如：Mike went to Italy last year, so did Amy(she). So she did是强调句式，表示“她确实如此”，是不同的两个人发表意见，但是陈述的主语是同一个人。例： -----She went to Italy last year. -----So she did.