英语语法(牛津版)第三十三章 目的

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334 不定式表示目的
表示目的时可以使用下列各种方法:
A 单独的不定式:
He went to France to learn French.
他去法国学习法语。
They stopped to ask the way.
他们停下来问路。
当主要动词之后有一个间接宾语时,不定式可能指这个间接宾语而不是指主语:
He sent Tom to the shop to buy bread
他派汤姆到店里去买面包。(该由汤姆而不该由主语“他”去买面包。)
B in order/so as+不定式
in order+不定式意指主语想要做这一动作,或主语很希望这一动作发生。
so as+不定式仅指主语很希望某一动作发生。因此in order +不定式比so as+不定式更为普遍。
in order或so as也常用于以下情况:
1 与否定不定式连用,表示否定性的目的:
He left his gun outside in order/so as not to frighten us.
为了不使我们受到惊吓,他把枪放在了外面。
2 与to be和to have连用:
She left work early in order/so as to be at home when he arrived.
为了在家等他到达,她提前下了班。
She gave up work in order/so as to have more time with the children.
为了能有更多的时间和孩子们相处,她放弃了工作。
3 表示不是近期能实现的目的:
He is studying mathematics in order/so as to qualify for a better job.
他学习数学是为了能有资格做更好的工作。
She learnt typing in order to help her husband with his work.
她学习打字是为了帮助她丈夫工作。
4 有时在较长的句子中,用于强调不定式表示目的:
He was accused of misrepresenting the facts in order/so as to make the scheme seem feasible.
人们指责他为了使计划显得可行而没有如实地把真相说出来。
He took much more trouble over the figures than he usually did in order/so as to show his new boss what a careful worker he was.
为了向新老板显示他是工作非常细心的人,他在这些数字上费了比往常更多的力气。
(但是in order/so as并非必要,有时是可省略的。)
表示目的的不定式位于主要动词之前时,in order/so as可位于句首:
In order/So as to show his boss what a careful worker he was,he took ex- tra trouble over the figures.
为了向新老板显示他是个工作非常细心的人,他在这些数字上费了比平常更多的力气。(但这里的in order/so as也可以省略。)
5 句中有一个间接宾语而要想让不定式毫不含混地指主语时,可用so as/in order:
He sent his sons to a boarding school in order/so as to have some peace.
为了图清静,他把他的儿子们送进了寄宿学校。(这里是指他要清静,而不是他的儿子们。)
比较:
He sent his sons to a boarding school to learn to live in a community.
为了让儿子们学会在集体中生活,他把儿子们送进了寄宿学校。(是让他的儿子们学会在集体中生活,而不是他。)
但是in order/so as的这种用法不是很普遍,更常说:
He sent his sons to a boarding school because he wanted to have some peace.
他把儿子们送进寄宿学校,因为他想清静点儿。
C in order(不包括so as)可用于强调不定式所表示的是主语脑子里真正想要达到的目的:
—He bought diamonds when he was in Amsterdam!
—That wasn´t surprising.He went to Amsterdam in order to buy dia- monds.
—他在阿姆斯特丹时竟买了一些钻石!
—这并不奇怪,他就是为了买钻石才去阿姆斯特丹的。(不是为了其他目的。)
另外也可用重读第一个动词而省略in order的方法来表示同样的意思:
He'went to Amsterdam to buy diamonds.
他去阿姆斯特丹就是为了买钻石。
D 不定式+名词+介词:
I want a case to keep my records in.
我想要一个盒子来保存我的唱片。
I need a corkscrew to open this bottle with.
我需要一个螺丝刀来打开瓶塞。
注意:这里谈论的是特指的目的。
关于泛指的目的可用for+动名词结构来表示:
This is a case for keeping records in.
这是用来保存唱片的盒子。
A corkscrew is a tool for opening bottles.
螺丝刀是用来开启瓶塞的工具。
335 用于go和come之后的目的不定式
一般在祈使语气或go和come的不定式之后不再使用目的不定式。常用Go and find Bill(去把比尔找来)来代替Go to find Bill;用Come and talk to Ann(来跟安说说话)来代替Come to talk to Ann。即:两个祈使动词用and连接起来时可代替一个命令+目的不定式。
在一般情况下说:
I must go and help my mother.
我必须去帮助我母亲。
I´ll come and check the accounts.
我将来清理账目。
而不是说:
I must go to help my mother.
I´ll come to check the accounts.
即:用and连接两个不定式结构来代替不定式+目的不定式结构。(参见第246节Ⅰ。)
但如go和come用做动名词或以任何现在时态和过去时态出现时,应带一个表示目的的不定式:
I´m thinking of going to look for mushrooms.
我想去采蘑菇。
I went to help my mother.
我去帮助母亲了。
I´ve come to check the accounts.
我来查账来了。
I didn´t come to talk to Bill;I came to talk to you.
我不是来跟比尔说话的;我是来跟你说话的。
337 in case和lest
A in case
1 in case+主语+动词可跟在陈述句或命令句后面:
I don´t let him climb trees in case he tears his trousers.
我不让他爬树,以免撕破裤子。
句子的第一个动作常常是为if从句中的动作所做的准备或是对它采取的预防措施。if从句表示将来可能发生的动作。in case+一般现在时常意为because this may happen/because perhaps this will happen/for fear that this may happen(因为这大概会发生/因为这也许将会发生/以免它会发生)。
in case+一般过去时常意为because this might happen/be- cause perhaps this would happen/for fear that this would happen (因为这会发生/因为这将会发生/以免它会发生)。
在这里,无论现在时或过去时都可用should+动词原形来代替。should在此表示更小的可能性,但是这种结构不常见。
2 各种时态与in case连用

I´ll make a cake in case someone drops in at the weekend.
我将做个蛋糕以免有人周末来。
I carry a spare wheel in case I have/should have a puncture.
我带了个备用轮胎,以免车胎被刺破。
I always keep candles in the house in case there is a power cut.
我家里常备有蜡烛,以防断电。
I always kept candles in the house in case there was a power cut.
我家里以前常备有蜡烛,以防断电。
(另参见第227节。)
B lest意为for fear that(恐怕),后面跟should:
He doesn´t/didn´t dare to leave the house lest someone should recognize him.
他不敢出门,怕有人认出他来。
lest除在较正式的书面英语中出现外,一般不常用。
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