用法不同。as well往往用在句尾，表示“還，也”的意思。as well as常用來連接兩個(gè)并列的成分，作“也，還”，它強(qiáng)調(diào)的是前一項(xiàng)，后一項(xiàng)只是順便提及，因此連接并列主語時(shí)，謂語動(dòng)詞與前一項(xiàng)一致。

as well as用于本義，可視為as…as結(jié)構(gòu)與well的自然搭配，其意為“與……一樣好”，在否定句中可用not so well as代替not as well as。如：

He speaks English as well as her.他說英語說得跟她一樣好。

用于引申義，表示“不但……而且”“既是……也是”“而且”“還”。如：

He grows flowers as well as vegetables.他既種菜也種花。

有時(shí)還可譯為“除……之外，還”，與besides， in addition to的用法相似。如：

As well as learning to swim he has been taking Spanish lessons this summer.今年夏天，他除了學(xué)習(xí)游泳外，他還在上西班牙語課。

當(dāng)as well as連接兩個(gè)成分作主語時(shí)，其后的謂語通常要與前面一個(gè)主語保持一致。如：

Tom as well as his parents is going toLondon.湯姆和他的父母要去倫敦。

as well as通常被視為介詞，所以后接動(dòng)詞時(shí)，一般用動(dòng)名詞形式。如：

He sings as well as playing the piano.他不但會(huì)彈鋼琴，而且會(huì)唱歌。

as well as后接動(dòng)詞用動(dòng)名詞的情況主要見于主句謂語為簡(jiǎn)單時(shí)態(tài)(即一般現(xiàn)在時(shí)和一般過去時(shí))的時(shí)候。

如果主句謂語為復(fù)合時(shí)態(tài)(即其中含有情態(tài)動(dòng)詞或助動(dòng)詞)，則as well as后的動(dòng)詞通常要與情態(tài)動(dòng)詞或助動(dòng)詞后的動(dòng)詞形式保持一致。如：

Students should pursue their own interests， as well as do their school work.學(xué)生不僅應(yīng)該做要好家庭作業(yè)，而且還要有自己的興趣。

如果as well as是連接兩個(gè)不定式，則其后用不帶to的不定式。如：

A museum should aim to entertain as well as educate.博物館不僅要有教育性還且還要有娛樂性。

當(dāng)as well as用于句首時(shí)，其后習(xí)慣上要接動(dòng)名詞。如：

As well as eating a seven-course meal， they drank three bottles of wine.除吃了一頓有七道菜的飯之外，他們還喝了三瓶酒。

as well as有時(shí)也被視為準(zhǔn)并列連詞，后接的動(dòng)詞可以與主句謂語動(dòng)詞形式一致（但這種情形遠(yuǎn)不如用后接動(dòng)名詞普遍）。如：

He publishes as well as prints his own books.他不但印刷而且還出版自己的書。

來源：高三網(wǎng)