good形容詞，well為副詞，前者修飾名詞，后者修飾動詞。well專指“身體好”，用法可相當于“fine”，good不能“身體好”。well還可做感嘆，表示強調和猶豫。二詞用法要牢記，千萬不能弄混淆。

well和good相關短語用法對比

1.be good at 與 do well in：兩者均可表示“擅長”。如：

He is good at languages. 他擅長學語言。

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。

注：表示擅長某一學科時，也可用be good in。如：

He is good at [in] maths. 他擅長數學。

2. as good as 與 as well as：用于本義時，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，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. 她不但漂亮，而且聰明。

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

希望對你有幫助，祝你進步。