牢记一条规律 巧学一类句型，本文主要内容关键词为：句型论文,规律论文，此文献不代表本站观点，内容供学术参考，文章仅供参考阅读下载。
平时的学习中，既要重视对基础语法的掌握，也要能灵活应用，举一反三，多总结些对解题有帮助的具有规律性、一般性的条条杠杠，有助于强化对句型的掌握，以十例为证：
规律一
1.that，可引导所有的名词性从句，但是：
that本身无词义，常引导名词性从句，此时的从句意义完整，虽不充当任何成分但不省略（宾语从句除外）。如：
That fashion differs from country to country may reflect the cultural differences from one aspect.（2002上海春季）
It worried her a bit that her hair was turning gray.（it为形式主语）
2.that，which都可引导定语从句，但排除以下两种情况尽可能用that不用which
(1)关系代词前有介词时：This is the house in which Lu Xun was born.
(2)引导非限制性定语从句：如：He has a daughter.who works in a hospital.
The result of the experiment was very good,which we hadn't expected.（NMET2000春季）
规律二
whether，if指“是否”时，两者都能引导名词性从句，在选项中同时出现时，选whether没错，因为：
(1)当引导一个没有疑问词的问句时，两者均可，如：
I'm not sure whether(if)I'll have time.
(2)当提出两种选择时要用whether，如：
Let me know whether you can come or not.
(3)whether可用在介词后，if则不可，如：
I haven't settled the question of whether I'll go back home.
(4)whether可与不定式连用，if则不行，如：
She doesn't know whether to get married now or wait.
(5)引导主语从句时，if不能放句首，whether在句首、句中均可。
Whether we'll go camping tomorrow depends on the weather.(NMET1996)
规律三
在主从复合句中，从句的语序一般为陈述句序，即：主语＋谓语动词。
(1)Whoever leaves the room last should lock the door.（主语从句）
(2)He wants to become a friend of whoever shares the same interest.（宾语从句）
(3)Helen had left her keys in the office so she had to wait until her husband came back.(NMET1996)（时间状语从句）
(4)They watched the train until it disappeared in the distance.(NMET198)（时间状语从句）
(5)Even though he is poor，she loves him.=He is poor,yet she loves him.（让步状语从句）
(6)Not until all the fish died in the river did the farmers realize how serious the pollution was！
(NME1995)
但是要注意部分倒装现象：
(1)在句首或强调句中时，一般用until而不用till；在句首时，主句谓语要部分倒装而从句不倒装，如：
So difficult did I feel it to live in an Englishspeaking country that I determined to learn English well.（2001上海）
(2)as引导让步从句时，从句用部分倒装语序，将表语、状语等y置于句首，可与though互换。如：
a.Poor though/as I am,I can afford it.
b.Much as I have traveled,I have never seen anyone who's as capable as John.（上海2001）
(3)no matter what/how等只能引导以形容词或副词为中心的让步状语从句，且用部分倒装形式，如：
9.How late he is,Mother will wait for him to have dinner together.(NMET1997)
b.We will have to finish the job,however long it takes.(NMET1999)
规律四
当从句的主语与主句的主语一致时，从句可转化为一短语，如：in order to do sth./so as to/ in order that/so that。
两者都可以引导目的状语从句，从句中通常要有can/could,may/might,will/would等情态动词，in order to do sth./so as to do sth./to do sth.
a.John shut everybody ont of the kitchen so that he could prepare his grand surprise for theparty.(NMET2002)
John shut everybody ont of the kitchen in order to/so as to prepare his grand surprise for the party·(NMET2002)
b.They set off for the station very early in order that/so that they might not miss the first bus.
c.I don't know what I should do with the problems.
I don't know what to do with the problems.
规律五
从句的时态：当主句的时态是一般将来时；状语从句的时态常用一般时态代替将来时，如：
1.I'll go and see her on Friday,after I get the new address.
2.Please send for a doctor as soon as it is possible.
3.Don't be afraid of asking for help when it is needed.(NMET2003)
规律六
从句的省略：时间状语从句像其它状语从句一样，可以省去“主谓”。如：
上述两例可变为：1.I'll go and see her on friday,after getting the new address.
2.Please send for a doctor as soon asS possible.
但要注意以下原则：
(1)当从句的主语是it，谓语动词是be时，两者均可省去，如上例2。
(2)当从句的主语与主句的主语一致，谓语动词是be时，如：
When(he was ill)still a boy of ten,he had to work day and night.
Metals expand when heated and contract when cooled.金属受热时膨胀，冷却时收缩。
I have tried to keep his advice in mind when doing the job做这件工作时，我心里一直记着他的忠告。
规律七
在suggest,demand,insist,order,request等表示“建议，命令”动词后的宾语从句要用虚拟语气即(should)+do的形式，以及相对应的复合句中，也用(should)+do的形式，如：
a.We suggest that she be sent to hospital.（宾语从句）
b.He gave orders that the guests each be given a gift for.（同位语从句）
c.It is demanded that we not go there on foot.（主语从句）
规律八
祈使句的反义疑问句形式一般为：will you？
If you want help—money or anything,let me know,will you？（2003上海春季）
Be sure to write to us,will you?(NMET1993)
—Alice,you feed the bird today,will you?(NMET1999)
—But I fed it yesterday.
祈使句的反义疑问句形式常用will you？，即使是肯定结构的祈使句也用will you？偶尔用won't you？
规律九
不定式、分词作状语时，其逻辑主语应是句中主语，如不符合即错。
________,the vitamin C in them will be destroyed.
A.If vegetables are cooked too long
B.If cooked too long
C.If cooking too long
D.If cookingthem too long
选B项的逻辑主语是vegetables，选项C，D的逻辑主语是“人”，均与句子的主语“vitamin C”不对应，因此都不对，故选A。
To sleep late in the morning,Bob turned off the alarm.（NMET2001春季）
规律十
主句是I suppose,I think,I believe,I guess（既是第一人称又是此类动词）等构成附加疑问句时，附加疑问句部分往往与that从句的主谓保持对应，否则随主句而定，如：
1.I don't suppose anyone will volunteer,will they?
2.Mrs.Black doesn't believe her son is able to design a digital camera,does she?（2002上海）
3.Brain told you that there wasn't anyone in the room at that time,does she?（2002上海春）