幫我睇下呢句有咩錯

This sentence is correct except for the punctuations.

The complete sentence is like this:
Smart people don't do as stupid people told them to do.

Omitting the last three words is acceptable. In fact, the sentence reads better in the shorter form.

Smart people don't do as stupid people told.

2012-01-19 01:58:16 補充：
There are other ways to express the same idea but yours is the correct way in using "as" as the conjunction

2012-01-24 00:19:45 補充：
There is no need for what after as.

Do as I told. (Do + adverb clause)
Do what I told. (Do + noun clause)

2012-01-24 00:21:57 補充：
Do as what I told. (redundant)

do好少跟as,冇個what都少咗連接,明個意思,但個寫法怪.
其他人改嘅應該都啱嘅:
smart people don't follow what stupid people suggest
或者你嗰句改做:
smart people don't do (as) what stupid people tell them to(意思唔講係明,但寫得太簡單,會令人聯想第2樣嘢,所以句子,唔一定寫得簡單意思就明) (do)用現在式表達出聰明人,蠢人,日常,對每個人都係咁.
因為有蠢人,聰明人,唔用被動式,如果得聰明人,就可以用.

假設你是想寫" 聰明人唔會聽蠢既人話"
smart people won't listen to stupid people.
或者
smart people won't do what dumb people tell them.

至於原句就verb的時態和tense的用法都有問題

Smart people don't listen to stupid people

'聽...的話' 用'listen to'係最 common, 用'do'唔係錯但好少咁講 (e.g. 'Long time no see' 文法上冇錯, 但唔會咁講)

The possessive is a form used to show that something belongs to somebody eg.stupid's say.
The expression:-(as what those stupid people told them to do.)
Or,Smart people don't do as (they)are told by (those) stupid people.
Or,"smart "told "stupid"he could not do as what the latter told.
are all attempts to answer.

Smart people don't do anything stupid