Ⅰ. seem “看来、似乎”既可作连系动词，以可做不及物动词，后接：形容词、名词、介词短语或不定式。 如：
① Mother seemed to know that. 母亲好像知道那件事。
② Bill doesn’t seem to a understand. 比尔似乎不太理解。= Bill seems not to understand.(这更正式)
Ⅱ. 常用搭配：
① It seems (that)好像、看来、似乎，如：
1. It seems to me that her accident is all your fault! 在我看来她出事都是你的错。
2. But it seemed that it wasn’t the only letter. 但是好像这不是唯一的一封信。
② seem as if / though. “看起来像”如：
1. It seems as though Ken will win the rice.看来赛跑Ken好像要赢。
2. It seems (as if ) it is going to rain. 天好像要下雨了。
Ⅲ. look “看来、似乎”着重于由视觉得出的印象，seem 则暗示有一定根据，这种判断往往接近事实。在搭配上两者都可接：形容词、名词(前常有形容词修饰)、动词不定式to be、过去分词 和 介词短语。如：
① He looks / seems a nice man.他看上去是个好人。
② You look / seem tired. Let’s have a rest. 看来你累了，我们休息一会儿。
③ The boy looked / seemed to be very ill. 那男孩看上去病得很重。
Ⅳ, 但在下面情况下，只能用seem, 不能用look:
1. 后面接动词不定式：to do 时。如：
① The captain seemed to know all his soldiers.
2. 用于It seems that …结构时。如：
① It seemed that he had missed the train.看来他没搭上火车。
3. 用于There seemed to (不定式) 结构时：如：
There seemed to be hundreds of people on the playground. 运动场上好像有几百人。