区别：appear，look 与 seem
[思路分析]seem 和 appear都含有“看起来似...”的意思。
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。例如:
He appears to know more than he really does.
他看起来好象懂得很多, 其实懂得没有那么多。
seem表示有一定根据的判断, 这种判断往往接近事实。 例如:
The problem seems very complicated.
问题仿佛很复杂。
His health seems to have grown better.
他的健康似乎有所好转。
He seems to be sick, for he appears pale.
看样子他病了, 因为他面色看起来很苍白。
[解题过程]
seem,look,appear这三个词一般用作半系词，都可以汉译作“似乎”或“看上去”。
seem所表示的“似乎”或“看来”是以客观的迹象为依据的A pilot noticed a balloon which seemed to be making for a Royal Air Force Station nearby.
一位飞行员看到一个气球，好象要飞向附近的英国空军基地。
It seemed certain that this would win the prize.
这一块要得奖似乎是毫无疑问的了。
look所表示的“看来”是以视觉所接受的印象为依据的；
He looked pale and his clothes were in a frightful state.
他看上去脸色苍白，一身衣服弄得一塌糊涂。
My wife was wearing a hat that looked like a lighthouse.
我的妻子戴着一顶看起来好象一座灯塔的帽子。
appear与上两个词的含义似乎没有多大差异，但是如果要表示某种判断是由被歪曲了的印象而得出的，最好用appear。
Babies of two months old do not appear to be reluctant to enter the water.
两个月的婴儿并不显得不肯下水。
The actress is thirty-five years old,but she appears a lot younger.
那个女演员三十五岁了，但是她看上去年轻得多。
正误辨
三者均可用作连系动词，意为“好像”、“似乎”等，区别如下：1. 从词义上看：look 指视觉印象；appear 指外表给人的印象；这两者可能是真象也可能是假象，appear 的不确定性更大一些。seem 侧重指根据某种迹象作出的推断，也不一定是事实。
2. 从句型搭配和用法上看：
(1) 三者均可后接不定式，但 look 之后一般只限于 to be (且较少见)。如：
正：He seems to be tired. 他好像很累了。
正：He seems to have travelled a lot. 他似乎去过不少地方。
误：He looks to have travelled a lot.
(2) look, seem 之后可接介词 like，但 appear 之后一般不能。如：
He looks like a fool. 他看起来像个大傻瓜。
(3) appear 和 seem 不用于进行时态，但 look 有时可这样用。如：
正：He looks well. 他看上去气色不错。
误：He is seeming well.
(4) 三者均可用于 it 开头的句子，且三者之后均可接以 as if 或 as though 引导的从句，另外 appear 和 seem 之后还可接 that 引导的从句。如：
It looks as if he has lost interest in his job. 看来他对自己的工作已失去了兴趣。
It seems that he is very tired. 他似乎很累了。
注：后接 that 从句时，有时可用 so，not 代之。如：
A：Are they reliable? 他们可靠吗?
B：It seems so (not). 似乎是可靠的(不可靠)。
另外，比较以下同义句型：
It seems that he is ill. ＝He seems to be ill. 他似乎病了。
又一说：
一、含义上的差异appear 是指根据事物的外表表象做出判断的，但实质上并不一定如此；seem是表示说话人主观上的判断，暗含有一定的根据，往往接近事实的判断；look是根据视觉印象而得出的判断，实质上也可能如此。例如：
She is fifty but she appears young . 她五十岁了，但看起来很年轻。(其实并非如此)
Se seems young . (I think he is rich .) 她看起来很年轻。(根据个人的主观判断而推断出)
She looks young . 她很年轻。(从他外表可出感觉出)
二、用法上的差异
1. appear，look，seem 后均可带名词、形容语、to be 结构。
The man who came yesterday appeared / seemed / looked an hounest man . 昨天来的那个人看来是一个诚实的人。
My brother appeared (to be) happy when he heard from sister . 当我弟弟收到我妹妹来信时，似乎很高兴。
2. look 可用于进行时，而 seem , appear 一般不能。如：
He is looking very happy. 他现在看起来很高兴。
3. appear 和 seem 之后可接动词不定式的一般式、完成式以及其他形式，而 look 之后除了能接to be 结构外，不接其它动词不定式形式。
She appeared to agree with you. 他好象同意你的意见。
They don’t seem to have read this novel. 他们好象没有读过这本小说。
4. look , seem 能与介词 like 构成习语，意思是“看上去象”，而 appear 却不能。例如：
It seems like years since I last saw you . 自从上次见到你后，好象很久没有见到你了。
He looks like a farm.他看起来象个农民。
5. seem , look 后均可接 as if , as though 引导的表语从句，从句中既可用陈述语气也可用虚拟语气，而 appear 则不能。例如：
It seemed / looked as if he had been to Beijing. 看起来他去过北京。
（IsaacZ注：此点与2楼所述不同，请到www.yahoo.com搜索（带引号）"appear as if" 求证，appear可变换多种时态，前面试加it）
6. appear 和seem 均可接 that 引导的从句，而 look 不能。
It seems / appears that we won’t finish this work today. 我们好象今天完不成这项工作。
7. appear 和 seem 可用于there be 结构中，而 look 不能。如：
There appears to have been an accident . 好象出了一次事故。
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