Module 2 No DrugsSection Ⅱ Grammar语法指南Ⅰ
Infinitive of purpose(不定式表目的)1.不定式或不定式短语作目的状语
(1)不定式或不定式短语作目的状语时,主要用来表示某一动作或状态的目的
为了使目的的意义更加清楚或表示强调意义时,还可以用短语 in order to 或 so as to 来表达
I've written it down in order not to forget
我怕忘记,把它记下来了
(2)不定式或不定式短语表示的是主语的目的,因此,其逻辑主语通常是句子的主语
试比较下面两句话:To draw maps properly,a special pen is needed
(误)To draw maps properly,you need a special pen
(正)要正确画出地图,你需要一支特殊的笔
由 in order to 引导的目的状语既可以置于句中,也可以置于句首,而由 so as to 引导的目的状语只能置于句中,不能置于句首
试比较:So as to get there in time,they started early
(误)They started early in order to get there in time
(正)=In order to get there in time,they started early
(正)=They started early so as to get there in time
(正)他们出发得很早,以便及时赶到那里
2.不定式的复合结构作目的状语
当不定式或不定式短语有自己的执行者时,要用不定式的复合结构(即在不定式或不定式短语之前加 for+名词或代词宾格)作状语
He opened the door for the