從詞性用法上比較good只用作形容詞，不用作副詞，其副詞形式用well。well既可用作副詞，也可用作形容詞。用作形容詞時(shí)，其用法很有限，只表示“健康的”“恰當(dāng)?shù)摹被颉傲钊酥幸獾摹钡取?/p>

從相關(guān)短語用法上比較

be good at 與 do well in：兩者均可表示“擅長(zhǎng)”。如：

He is good at languages. 他擅長(zhǎng)學(xué)語言。

She is good at telling stories. 她擅于講故事。

They all did very well in the examination. 他們這次都考得很不錯(cuò)。

注：表示擅長(zhǎng)某一學(xué)科時(shí)，也可用be good in。如：

He is good at [in] maths. 他擅長(zhǎng)數(shù)學(xué)。

2. as good as 與 as well as：用于本義時(shí)，兩者均可表示“與……一樣好”，但 good 是形容詞，而 well 是副詞。如：

他說英語說得跟她一樣好。

正：He speaks English as well as her.

正：His English is as good as hers.

但是，用于引申義時(shí)，兩者的意思很不相同：as good as 意為“幾乎”“差不多”(=almost)，as well as 意為“而且”。如：

The work is as good as finished. 工作差不多干完了。

He as good as said I’m a liar. 他無異于說我撒謊。

She’s clever as well as beautiful. 她不但美麗，而且聰慧。

As well as breaking his leg, he hurt his arm. 他不但摔斷了腿, 而且還傷了胳膊。

來源：高三網(wǎng)