你可以試著比較一下 [1] http://www.learnersdictionary.com/search/for 第4點提到 for 是 "used to indicate the person that a statement refers to" [EX] Seeing her again must be difficult for him. http://www.learnersdictionary.com/search/to 14a提到 to 是 "14 a : in the opinion of (someone)" [EX] To him, the work seemed unnecessary. [2] http://www.oxfordadvancedlearnersdictionary.com/dictionary/for 第 19點 for: "used to say how difficult, necessary, pleasant, etc. something is that somebody might do or has done" [EX] For her to have survived such an ordeal was remarkable. http://www.oxfordadvancedlearnersdictionary.com/dictionary/to 第18點提到 to: "used to show what somebody's opinion or feeling about something is" [EX] It sounded like crying to me. [3] . I realize that things which I once could do easily are painfully hard for me today. (Time, 1936//03/30) [4] What made this incident particularly hard for me was the fact that I take great pride in the depth of my research and the extensiveness of my citations. (Time, 2002/02/04) [5] be hard for somebody It must be hard for her, bringing up three kids on her own. (http://www.ldoceonline.com/dictionary/hard_1) [6] Life has been very hard for her. (http://www.learnersdictionary.com/search/hard) [7] hard for somebody (to do something) It's hard for old people to change their ways.It must be hard for her, bringing up four children on her own. (http://www.oxfordadvancedlearnersdictionary.com/dictionary/hard) [8] Soon everybody was kissing everybody. Nancy was radiant. Everything's beautiful to the bride, " she said. (Time, 1967/08/25) 看這些說明與例句，我們可以做一個簡易的歸納: "for" 比較偏向 「(可能) 經歷事情產生的感覺」 "to" 則偏向傳達「個人意見」 北京大學英語系教授薄冰在他的著作「英語語法指南」 (p.759) 寫到: 「good for 與 good to 皆可意謂 "對…有益處 。這是語言上一種相互交叉的現象。 也就是說，兩者的本意並不相同，for指 "目標"，強調客觀情形， to指"方向"， 強調主觀意向」。不過確實很多情況下，各個形容詞本身的搭配才是重點。 如果硬要只憑 "to" 和 "for"就想分析一切，會有偏頗之嫌。 希望以上回答對你有所幫助 :) --

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