Relative pronouns join dependent adjective clauses to their antecedents in complex and compound-complex sentences．The three most frequently used relative pronouns are who，which，and that．A relative pronoun must agree with its antecedent in number，gender，and person．

关系代词将形容词从句（或称关系从句）与其先行词联系起来，它与先行词必须在人称、数和性方面保持一致。常用的三个关系代词是who，which，that。

My new computer，which is described as self-correcting，is excellent．

I have one of those new computers，which are described as self-correcting．

All of the books that are used for reference are in the north wing of the library．

It is not I who am requesting a transfer to another department in our company．

I am the one who is requesting a transfer to another department in our company．