This type of attributive still obey the principle that the attributive clause modify the word which is re- ferred to by relative pronoun.

This paper discccsses several points students often find difficult in their learning attributive clause,explains the various functions of the relative pronouns“as,but,and than”,and points out some special usages of other common relative pronouns for readers reference.

A study is conducted of English relative pronoun AS with regard to the structural characteristics of its an-tecedents,the nonrestrictive attributive clauses introduced by AS, the ondssion and inversion in the clauses, the syntactical function of AS in subordinate clauses and the case of the personal pronouns after AS.