连系动词seem, appear和look使用方法不同
三者均是表示状况的来连系动词，都有“仿佛”、“好像”的意思，不同如下：
seem 侧重指事实上好像是那样的；look 指视觉印象，指看着好像这样；appear 指从表面上看上去乎这样，但有时并不是这样。。如：
They seemed tired and unhappy when they got home. 他们回到家时看来非常累，不开心。
Be careful! The newly waxed floor looks very slippery. 小心点！这新打蜡的地板看着非常滑。
She appears quite old. 她看上去非常老。
三者均可后接不定式，但 look 之后一般只限于 to be：
The man seems / appears / looks to be very tired. 那人仿佛非常疲劳。
He seemed / appeared to have met her before. 他以前好像见过她。
三者均可用于 it 开头的句子，且三者之后均可接从句。如：
It seemed / as if / though the day would never end. 好像白天永远也过不完。
It looked as if he had been ill. 他看着像是生过病。
It seems / appears that he is very rich. 他好像非常富有。
为防止重复，appear和seem后接的 that 从句有时可用so或 not代替。如：
“Is he an honest man ?” “It seems / appears so / not.”“他是诚实的人吗?”“好像是 / 不是。”
look, seem 之后可接like短语，但 appear 之后一般不可以：
You look like your father. 你看着像你爸爸。
It seemed like a disaster at the time. 在当时就仿佛是一场灾难。
