2014年初三年级英语知识点
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二.重点语法 (一)疑问词+不定式动词”结构英语有个很有用的结构,就是:
疑问词+不定式动词(question word+to-infinitive)。
疑问词是疑问代词“who,whom,what,which,whose”和疑问副词“when,where,how,why”。
此外,此外,连接词“whether”也适用。
例句:I don't know what totry next.I'm not sure what toexpect.
“疑问词+不定式动词”结构有何功用呢?其主要功用有下列五种:
1.当主语,如:
When to hold themeeting has not yetbeen decided.Where to live is aproblem.
2.当宾语,如:
We must know what tosay at a meeting.
He could not tellwhom to trust.
Do you know how toplay bridge?
3.当补足语,如:
The problem is whereto find thefinancial aid.The question is whoto elect.
4.当名词同位语,如:
Tom had no ideawhich book to readfirst.
Do you have a roughimpression how to doit?
5.当宾语补足语,如:
Jim is not surewhose to choose.
Mary and John arenot certain whetherto get married ornot.
适用于“疑问词+不定式动词”的动词包括:
“know,see,decide,tell,ask,consider,discover,explain,forget,guess,hear,
imagine,inquire,learn,remember,think,wonder,understand”等。
值得特别注意的是:当这结构当宾语时,它的作用等于名词从句,例如:
I could not decidewhich dictonary tobuy.
=I could notdecide whichdictionary I shouldbuy.
Jack did not knowwhere to find such agood teacher.
=Jack did not knowwhere he could findsuch a good teacher.
有些动词,如“ask,show,tell,advise,inform,teach”等,
可以先有个宾语,然后才接着加上适当的“疑问词+不定式动词” 结构。例如:
The chief engineershowed them how torepair the machine.
Have you told himwhere to get theapplication form?
综上所述,可见“疑问词+不定式动词”结构是个形象清新,
既容易用又不容易出错的特别结构,可以多多运用。
(二)语从句(Attributive Clauses)
定语从句(AttributiveClauses)在句中做定语,修饰一个名词或代词,被修饰的名词,词组或代词叫先行词。
定语从句通常出现在先行词之后,由关系词(关系代词或关系副词)引出。关系代词有:
who,whom,whose,that,which等。关系副词有:when,where,why等。
例如:I like music that Ican dance to.
I love singers whowrite their ownmusic.
关系代词所代替的先行词是人或物的名词或代词,并在句中充当主语、宾语、定语等成分。
关系代词在定语从句中作主语时,从句谓语动词的人称和数要和先行词保持一致。
(1)who,whom,that 这些词代替的先行词是表示人的名词或代词,在从句中所起作用如下:
Is he the man who/that wants to seeyou? 他就是你想见的人吗?
(who/that在从句中作主语)
He is the man whom/that I saw yesterday.他就是我昨天见的那个人。
(whom/that在从句中作宾语)
(2)Whose用来指人或物,(只用作定语,若指物,它还可以同of which互换),例如:
They rushed over tohelp the man whosecar had broken down.那人车坏了,大家都跑过去帮忙。
Please pass me thebook whose(ofwhich) cover isgreen.请递给我那本绿皮的书。
(3)which,that 它们所代替的先行词是表示事物的名词或代词,在从句中可作主语、宾语等,例如:
A prosperity which/that had never beenseen before appearsin the countryside.
农村出现了前所未有的繁荣。(which/that在句中作主语)
The package (which/that)you arecarrying is aboutto come unwrapped.你拿的包快散了。
(which/that在句中作宾语)
(1)when,where,why 关系副词可代替的先行词是时间、地点或理由的名词,在从句中作状语。
关系副词when,where,why的含义相当于"介词+which"结构,因此常常和"介词+which"结构交替使用,
例如: I still remember theday when (on which)I first came here.
我至今还记得我初来咋到的那一天.
Beijing is the placewhere (in which) Iwas born.北京是我的出生地。
Is this the reasonwhy (for which) herefused our offer?这就是他拒绝我们帮助他的理由吗?
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