To solve this problem,this paper studies the agentful passive construction at the textual level,with the conclusion that the agentful passive construction can realize double effects simultaneously: thematic prominence and end-focus.

By using Verschueren\'s Theory of Linguistic Adaptation,this paper explores the textual-pragmatic functions of the agentful passive construction,namely,the realization of thematic prominence and end-focus simultaneously,adaptation to the principle of end-weight,adaptation to pragmatic contrast and adaptation to a consistent perspective.

Based on the result of experiments and the data from the corpus,this paper makes a comparative study between grammaticalization and grammar acquisition of mother tongue from the perspective of childrens’ acquisition of passive construction.

A full interpretation of the derivation of English passive cannot be made via Case Theory and EPP; formation of the passive construction concerns passivivation of the transitive in the syntactic level.

The paper believes that in a topic-prominent language, the more the passive construction is used,the more perfect the function o.

From the contrastive perspective,the author summarizes the active structures of passive meanings and the passive structures of active meanings in English,and illustrates the semantic features both of active structures and of passive structures.

There are two types of passive voice used in English: passive structure and quasi passive structure.

Non-signed passive form-idea passive form,pseudo-signed passive form-"You"-sentence,nominal-signed passive form-passive structure and the "Bei V"-type compound words are excluded from the genuine passive form.

The passive form is one of the grammatically common occurrences in English and it can be divided into the syntactic passive and the notional passive.