想問人你覺得點應該用what定how?

What = 什麼
How = 怎麼 (如何), (怎樣).

What do you think (of this) ? 你對 (這件事)有什麼想法？ = 你覺得點
How do (did) you think (of this) ? 你是怎麼想到 (這件事) 的？

Examples:

What do you think of this song ? (answer: this is a very romantic song)
How do (did) you think up this song ? (answer: I was up at night thinking about my girlfriend, and the lyrics just popped up).

What do you think of this coffee ? (answer: it tastes very good)
How do you like your coffee ? (answer (before it is prepared): double cream, double sugar, please.)
How do you like your coffee ? (answer (after tasting it): it tastes very good.)






2013-10-27 00:57:31 補充：
In general, use "what do you think". You are asking for an opinion. "How do you think" is not commonly used, because it is asking how the person comes up with that opinion.

what do you think? = similar to How do you feel? To ask people how they feel

How do you thnk? Grammatically correct but do not have the same meaning as what do you think or how do you feel?

I hope you understand the difference with the examples above.

有時候呢...我覺得最佳解答不是正確的答案...
我引用了MissingFatty的回答:


How do you think？ 你如何思考？

What do you think？你覺得如何？


（一）How do you think？
一般說來, 除了小朋友、可愛的喜憨兒, 是不會問："How do you think？"
因為他們不懂, 我們是用大腦思考的.
當然, 生理學的學生也可能問這個問題, 因為他們想理解大腦思考的機轉.
所以, 這些人問的話, 你就要回答："With my brain." 或 "I use my brain to think."


（二）What do you think？
這是用來問別人的感覺.
例如：What do you think of the coffee？
回答：It tastes bitter. / Terrific! / Kind of strong..., etc.
你也可以說：How do you like the coffee？
意思是一樣的.