It能用来“改变一个句子的结构,强调这个句子中的某一成分。”比如,说“It’s man that counts.”(起作用的是人。)就比说“Man counts.”语气强得多。因为该句的主语在“It’s…that…”结构中得到了强调。It的这种用法一般语法书都有论述。然而,具有同样作用的,“…whose job it is to do…”结构中的it却是一般语法书都不涉及的问题。本文试图对“…whose job it is to do…”结构的特点作初步的探讨,并顺便谈谈it的作用。先请看下面的例句: It can be used to “change the structure of a sentence, emphasizing a component of the sentence.” For example, saying “It’s man that counts.” (It’s human.) It’s better than saying “Man counts.” many. Because the subject of the sentence is emphasized in the “It’s...that...” structure. It’s a general grammar book for this usage. However, the “...whose job it is to do...” structure has the same effect as the general grammar book does not address. This article attempts to make a preliminary discussion of the characteristics of the “...whose job it is to do...” structure, and by the way talk about the role of it. First look at the following example sentences: