① as well as表示“等于，一样好”（equally with，no less than）。
He has understanding as well as you. 他的理解力和你的一样好。
② as well as相当于both…and，not only…but also，表示“既……又，除……之外（还）”。as well as同not only…but also换用时，要注意其侧重点不同。as well as侧重前项，而not only…but also侧重后项。所以，如果把as well as换为not only…but also，就应将这两个连词短语连接的名词互换位置。
It is a political as well as an economic question. 这不仅是一个经济问题，更是一个政治问题。
She did a little research as well as made a lot of experiments. 她不仅做很多试验，还做一些研究工作。
She plays the piano as well as sings. 她不仅会唱歌，而且会弹钢琴。
She not only sings but also plays the piano.
She has experience as well as knowledge.
She has not only knowledge but also experience. 她既有学识又有经验。
It is broad as well as long.
It is not only long but also broad. 它又长又宽。
She is clever as well as beautiful.
She is not only beautiful but also clever. 她不仅漂亮而且聪明。
③ as well as…not前后都否定，not as well as则否定前者，肯定后者。
比较
John，as well as Mary，has not yet read the book. 约翰和玛丽一样，都没有读过那本书。
John has not yet read the book as well as Mary. 约翰还没有读过那本书，但玛丽已读过。
比较
He，as well as you，will not go. 你将不去，他也将不去。（两者均否定）
He will not go as well as you. 你将去，但他将不去。（否定前者，肯定后者）
You helped her，as well as I. 不但我帮助了她，你也帮助了她。
You helped her as well as me. 你不但帮助了我，也帮助了她。
【考查】
He was there as well as me.【误】
（请改正）
She loves you as well as Henry.（歧义，请分析）
④ as well as替代better than，意为“与其……不如……”。
As well be hanged for a sheep as for a lamb. 窃钩不如窃国。
=Better be hanged for a sheep than for a lamb.
⑤ as well as可用作复合介词，表示“除了……之外还……”，相当于besides，可接名词或动名词。
I have a few English dictionaries as well as this. 除了这本外，我还有几本英语词典。
As well as teaching she did some social work. 除了教书外，她还做一些社会工作。
⑥ as well as连接两个不定式时，第一个不定式带to，第二个不定式不带to。
We cannot expect her to do the housework as well as look after the children. 我们不能指望她又照看孩子，又做家务。
⑦ as well as可以连接两个介词短语。
It is important for you as well as for me. 这件事不仅对我重要，而且对你也重要。
⑧ as good as意为①“等于，同样”（amounting to，not falling short of）；②“实际上，其实”（actually，in fact，virtually）。
He is as good as his promise/word. 他言出必行。
He as good as promised her that he would take her along. 他实际上等于答应了带她去。
Everything was as good as settled. 一切准备工作几乎已经做好了。
She as good as said so. 她事实上是这么说了。