1、sb./sth. + seem + (to be+)形容词+…这其实是个主系表结构，seem 作为连系动词，to be 是不定式作表语。例句：She seems to be busy. 她看上去似乎很忙。Kangkang seems to be worried. 康康似乎忧心忡忡。It seems to be funny. 看上去很滑稽。这种用法往往主语是单数，而且多用于目前的样子，即现在时，所以 seem + s比较多见。
2、sb./sth. + seem + like +…在这个结构中，like 是个介词，意为“像”，所以这也是个主系表结构，只不过表语是个介词短语 like...，例如：This area seems like another country. 这个区域看上去像别的国家。He seems like his father. 他看上去像他爸。
3、sb/sth + seem + to (do)这其实是个主系表结构，seem 作为连系动词，to do 是不定式作表语。例句：Li Hong seemed to like me. 当时的李红看上去喜欢我。He seems to have found a job. 他看来似乎已经找到了工作。
4、It seems that + 从句。在这个结构中，it 知识形式上的主语，真正的主语是后面的 that 从句。例句：It seems that nobody else will do such a foolish thing.好象没有别人会做出如此愚蠢的事情来。