seem用作连系动词或不及物动词，意为“似乎、好像、看来”。
“主语+seem+(to be)+表语 ”
此时seem为连系动词，后直接接形容词或to be+形容词或名词(短语)作表语，以说明主语的特征或状态。如:
Tom seems (to be)a very clever boy. 汤姆看上去是一个很聪明的男孩。
Everything seems easy.一切似乎很容易。
注意:afraid，asleep，awake等表语形容词不能直接跟在seem 之后，必须和seem to be 连用，如:They seem awake.(误)应改为:They seem to be awake.
“主语+seem +不定式(或不定式的完成式)”
此句型中的seem 用作不及物动词，不用在进行时态中，其与不定式一起构成复合谓语(不定式作宾语)。如:
a. The moon seems to change its shape. 月亮好像在变换形状。
b. I seem not to be able to make him happy. 我似乎不能使他高兴起来。
c. They seemed to be eating something. 他们好像在吃什么东西。
d. I seem to have caught a cold. 我似乎已经感冒了。
注意:seem 后跟不定式(短语)时，要注意不定式所表示动作发生的时间，以此来确定不定式的时态，如例c、d;seem 后不定式的否定式习惯上在seem 前加don’t ，也可以用seem not to...，如例b也可以说成:I don’t seem to be able to make him happy.
“seem +分词”
a. Our teacher seemed stopped by the question. 我们老师似乎被问题难住了。
b. The news seems exciting. 消息似乎令人兴奋。
注意:seem后用现在分词还是过去分词，取决于分词本身的逻辑主语，如句子的主语是分词的逻辑主语，用现在分词，如例b;反之用过去分词，如例a。
“seem+like+n/v-ing”
like在这里是介词，此句式等于seem to be结构。如:
It seems like years since I saw you last time.自从上次见到你，好像过了几年。
The girl seems like /to be a happy bird.那女孩好似一只快乐的小鸟。
“seem+ 介词短语”
They seem in high spirits .他们似乎境界很高。
seem 常用于it作形式主语的“It seems /seemed that...”结构中
该结构中it作形式主语，“that...”是真正的主语。此结构可以用seem后接不定式来改写。如:
It seems that you were lying. 好像你在说谎。
It seemed that he was ill， so I called in the doctor.
=He seemed (to be) ill， so I called in the doctor. 看来他病了，所以我请了医生。
注意:It seems that... 从句中，that从句可以用陈述语气，也可以用虚拟语气;或者在seem后可以跟一个形容词。如:
It seems impossible that he will be here tomorrow.他明天在这里好像不可能。
seem通常用在“It seems/seemed to sb (that)…”结构中，这种结构用来表示“行为”的主体。如:
It seems to us a good chance. 对我们来说似乎是一个好机会。
It seems to me everything is all right.对我来说似乎一切都不错。
seem也常用于“ There seem(s) to be+名词”结构中，to be可省略， seem的单复数形式要根据后面主语的名词单复数形式而定。如:
a. There seems to be no need to wait longer.似乎没有必要再等待了。
b. There doesn’t seem to be too much hope of our team beating theirs.看来我们战胜他们队没有多大希望了。
注意:
(1)此结构中seem表示 “似乎有;好像有……”，可以和It seems as if...转换。如:
There seem to be a lot of things to do.=It seems as if there are a lot of things to do.
(2)“Thereseem(s) to be +名词”这一结构的否定形式为“There seem(s) to be +no+名词”，如例a; 或“There doesn’t seem to be +名词”，如例b。
seem常用于由as if/though引导的从句中
a. It seems as if it was/were spring already.好像已经是春天了。
b. It seems as though our plan will be perfect.似乎我们的计划很完美。
注意:这种句式中，如果从句所叙述的事情实现的可能性较大或可以被设想为事实，从句的谓语用陈述语气，如例b;若实现的可能性小或根本不可能实现，从句用虚拟语气，如例a。
seem 有时和人称代词I连用，意为“感到好像，觉得似乎”。如:
a. I seem unable to solve it right now. 看来我无法立即解决它。
b. I seem to have seen him somewhere before.我觉得以前在什么地方见过他。
