定义。省略是为了避免重复、突出新信息并使上下文紧密连接的一种语法修辞手段。
一、并列复合句中的省略。
在并列句中，相同的成分如主语，谓语，宾语等都可以省略：
the boy picked up a coin in the road and (the boy ) handed it to a policeman.
your advice made me happy but(your advice made) tom angry .
tom must h**e been playing basketball and mary (must h**e been)doing her homework.
gao xiumin was born in 1959 and fu biao (was born) in 1963.
二、主从复合句中的省略。
1.定语从句中的省略：
1) 在限制性定语从句中，作宾语的关系代词 that ,which , whom 可以省略；而在非限制性定语从句中作宾语的关系代词 which , whom 不可以省略。
is this reason (that) he explained at the meeting for his carelessness in his work?
tom (whom) you saw yesterday fell ill.( whom可以省)
tom , whom you saw yesterday ,fell ill. (whom不可以省)
2)在口语和非正式用语中，关系副词when ,where , 和 why 经常用that 来代替，甚至还可省略。如：
a) this is the first time (when/that)he had trouble with the boss.这是他第一次麻烦老板。
b) he wants to find a good place (where/that) we can h**e a picnic during the “golden week ”holiday .他想找一个能在**周期间野餐的好地方。
c) could you tell us the reason (why/that)he was so unhappy ? 你能告诉我们他为什么如此不高兴吗？
3)当先行词为表示方式的 the way 时 ，从句不能用 how 来引导 ，应该用that 或 in which ，或将它们全部省略。如：
i don't like the way (that/in which) you laugh at her.我不喜欢你嘲笑他的行为。
2.状语从句中的省略：
1） 当状语从句的主语与主句的主语一致时，可以省略状语从句的主语和系动词be。
once (he was)a worker ,pang long now becomes a famous singer .
he looked everywhere as if (he was)in search of something .
while (he was) holding talks with president hu jintao ,us president george w. bush thanked china for its important role in the six-party talks.
the exhibition is more interesting than (it was) expected .
olympic gold medallist hurdler liu xiang opened his lips as if (he were) to speak。
一般说来省略现象多出现在下列五种状语从句中：
1)由 when ,while ,as ,before, after , till, until, once等引导的时间状语从句；
2)由whether ,if , unless 等引导的条件状语从句；
3)由though , although ,even if ,whatever等引导的让步状语从句；
4)由 as ,than 等引导的比较状语从句；
5)由as, as if , as though 等引导的方式状语从句。
2） 当从句的主语和主句的宾语一致时，间或也有这样的省略。
her father told her to be careful when (she was)crossing the street.
3） 当从句的主语是 it，谓语动词中又含有系动词be 时，可以把it和系动词be一起省略。
unless (it is) necessary ,you'd better not refer to the dictionary.
3.宾语从句中的省略。
1）在及物动词后面所接的宾语从句中，连词that 一般可以省略；但如果及物动词后面是由that引导的两个或两个以上的并列的宾语从句 ，那么只有第一个that可以省略。如：
i think (that) the reform of the renminbi's exchange rate is necessary.
he said (that)the anti-secession law had been passed and that president hu jintao had signed a presidential order.
2）由 which , when ,where , how,和 why 引导的宾语从句，可以全部或部分省略。如：
i know that nba star yao ming will come to our city but i don’t know when (he will come to our city).
he wants to move abroad but his parents wonders why (he wants to move abroad).
4.在与suggest ,request ,order ,advise 等词相关的名词性从句中，须用虚拟语气形式“should +动词原形”，should可以省略。如：
chirac, president of the republic of france suggested that the china-france culture year (should) last long in various forms.
5.主句省略多用于句首，在答语中，主句可全部省略。
it is a ) pity that i didn’t go to mary's birthday party yesterday.
why were you absent from school last friday ?
(i was absent from school)because my mother was ill.
三、简单句中的省略。
1.省略主语。
1)祈使句中的主语通常被省略如：
you) open the door, please.
2) 其它省略主语多限于现成的说法如：
i) thank you for your help .
it)doesn’t matter.
2.省略主谓语或主谓语的一部分如：
there is) no smoking.
is there)anything else ?
you come)this way please.
will you) h**e a smoke ?
3.省略宾语如：
do you know mr. li ?
i don’t know (him.)
4.省略表语如：
are you thirsty ?
yes , i am (thirsty).
5.同时省略几个成分如：
are you feeling better now?
(i am feeling ) much better (now) .
i wish) good luck (to you) .
四、动词不定式省略，只保留to 的场合。
1.不定式作某些动词的宾语时，这些动词常见的有：love, like, care, wish, hope, expect, prefer, refuse, mean , try , oblige , advise , persuade , agree , want , afford , forget , remember , try , manage等。
如：you should h**e thanked her before you left .
i meant to ,but when i was le**ing i couldn’t find her anywhere.
you can do it this way if you like to .
2.不定式作某些动词的宾语补足语或主语补足语时，这些动词常见的有：ask , tell ,advise, force, persuade, wish, allow, permit , forbid ,expect, order ,warn 等。
如 ：the boy wanted to ride his bicycle in the street ,but his mother told him not to.
she wants to come but her parents won’t allow her to (come).
3.不定式在句中作某些形容词的状语时，常见的形容词有：happy, glad ,eager , anxious , willing , ready 等。如：
i will be away on a business trip .could you mind looking after my cat ?
not at would be happy to (look after your cat).
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