2021军队职称英语指导：理工类句型语序技巧(8)

军队职称英语《理工类》句型语序技巧(8)
二.原因状语从句
I)because,since,和as引导的原因状语从句
1.其中because语气最强，多表示所述理由是本句重点，强调别人未知的事实，故because引导的从句多放在句末，回答why的问句时，只能用because。
在语气上since次之，as最弱。since和as表示的原因，多是已知的既成事实，原因以外的才是叙述的重点，因而两者多用于句首。
As it is raining,let’s stay indoors.
Since you have no license,you are not allowed to drive.
用强调句式强调原因状语从句时，只能用because引导。
It was because he was careless that he failed.
在because引导的从句中，如果主句是否定句，而主句和后面的从句之间没有逗号分开，这时not修饰的是后面的整个从句。
The machine did not stop because the fuel was used up.
机器停了下来，并不是因为燃料用光了。
如果主句和从句间用逗号分开，意思就不同了。
I was not kind to him,because he was rude.我对他不友好，因为他无礼。
II)for和because的区别
because表示因果关系，语气最强;而for引导的是并列句，它只是对前面分句进行解释，说明推断的理由，并且只能后置。
It must have rained last night,for the ground is wet this morning.
(该句不能用because,因为现在地面湿不是导致昨夜下雨的原因)
It is morning,for the birds are singing.天亮了，鸟儿在鸣叫。
(鸟鸣不能引起天亮，所以本句不能用because代替for)
三.结果状语从句
so…that,such…that,so,等引导出结果状语从句
注：I)注意so和such后面跟的词。其常见情况为：
so+adj./adv.+that;he is so clever that everyone likes him.
such a(an)+adj.+n.+that(=so+adj.+a(an)+n.+that)
such+n.(可数名词复数或不可数名词)+that
若名词前的修饰语为many,much,few,little则用so,不用such.
There is so much homework to do that I can’t play computer games today.
There is such lot of homework to do that I can’t play computer games today.
四.目的状语从句
I)so that,in order that和in case,lest等引导的目的状语从句
so that,in order that常与may,can,could,might等情态动词连用
In order that he shouldn’t wake up his wife,he came in quietly.
Ⅱ)in case,lest引导的目的状语从句多用虚拟语气结构：should+v.原形，意为“以防”、“以免”。例如：
He ran away lest he(should)be caught.
I hid the book in case she should see it.我把书藏起来，以防被她看到