实用英语语法：appear,look,seem的用法特点
一、基本区别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。
二、后接不定式的问题
三者均可后接不定式，但 look 之后一般只限于 to be(且较少见)：
He seems to be very tired. 他好像很累了。
He seems to have traveled a lot. 他似乎去过不少地方。
This seems to be a happy solution. 这似乎是一个理想的解决办法。
但是不说He looks to have traveled a lot.
三、后接like的问题
look, seem 之后可接介词 like，但 appear 之后一般不能：
He just looks like his brother. 他的模样就像他的哥哥。
He seems like a fool. 他看起来像个傻瓜。
四、用于进行时态的问题
appear 和seem不用于进行时态，但look有时可这样用(尽管较少见)：
He looks well. 他看上去气色不错。
但是不说He is seeming well.
五、用于it开头的句子
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：
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。
为避免重复，appear和seem后接的 that 从句有时可用so, not 代之：
"Is he reliable? " "It seems so (not)." “他可靠吗?”“似乎是可靠的(不可靠)。”
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