三者均属于表示状态的来连系动词，都有“好像”、“似乎”的意思，区别如下：
(1) seem 侧重指事实上似乎是那样的；look 指视觉印象，指看起来似乎如此；appear 指从表面上看似乎如此，但有时并非如此。。如：
They seemed tired and unhappy when they got home. 他们回到家时看来很累，不高兴。
Be careful! The newly waxed floor looks very slippery. 小心点！这新打蜡的地板看起来很滑。
She appears quite old. 她显得很老。
(2) 三者均可后接不定式，但 look 之后一般只限于 to be(且较少见)：
The man seems / appears / looks to be very tired. 那人好像很疲劳。
He seemed / appeared to have met her before. 他以前似乎见过她。
单词：appear的近义词、反义词、形近词辨析
appear/seem
The sky appears blue to us on earth.我们从地面上来看天空是蔚蓝色的。
These ideas may seem strange to you.这些想法对你来说似乎是奇怪的。
<辨析>这两个动词都有“看起来似......”的意思，差别不大，只是 appear 强调外表上给人某种印象，有时含有实质上并非如此的意思。seem 则暗示判断有一定根据，这种判断往往接近事实。如：He appears (to be) uneasy.他显得很不自在。（内心不一定如此）He seemed (to be) uneasy.他显得不自在。（可能确实不很自在）在搭配上应注意以下几点：1)两者都可跟形容词和 to be 结构，也可用在 it appears (seems) that 结构中。如：It seems (appears) that the book is too difficult for us.看来这本书对我们是太难了。2)可以说 it seems as if...，不能说 it appears as if...。如：It seems as if it's going to rain.天好象要下雨了。(不能用 appears 代替 seems)
与单词：appear 相关的例句或者名人名言
I'm so excited! My idol is about to appear on stage!
真是太激动了！我的偶像马上要出现在舞台上了！
He will appear in the role of mediator.
他将出演调停者。
The accused is to appear in court on Tuesday.
被告将于星期二出庭。
Just imagine how happy she will be if you suddenly appear before her.
想想如果你突然出现在她面前，她会多么高兴。
※Wherever in the world a people knows desperate want, there must appear at least the spark of hope, the hope of progress--or there will surely rise at last the flames of conflict.——Dwight Eisenhower,Commander in chief of the Allied forces in the second World War 任何地方，一个民族只要知道自己迫切需要什么，那里就会出现希望的火花，出现进步的希望，换句话说，最后必定会燃起抗争的火焰。第二次世界大战中盟军最高司令 艾森豪威尔，D.
