实用语法：现在分词和过去分词的用法

 　现在分词和过去分词主要差别在于：现在分词表示“主动和进行”，过去分词表示“被动和完成”(不及物动词的过去分词不表示被动，只表示完成)。分词可以有自己的状语、宾语或逻辑主语等。

　　1)分词作状语分词在句子中作状语，可以表示时间、条件、原因、结果、让步、伴随等。分词做状语时，它的逻辑主语与句子的主语一致。作状语的分词相当于一个状语从句。

　　【例如】

　　Hearing the news, they all jumped with joy. Using what you know of word stems¹ and word formations, you can make a guess at the meaning of a new word.

　　The students went out of the classroom, laughing and talking. Accompanied by his friend, he went to the railway station.Given better attention, the plants could grow better.

　　He looked tired and depressed², visibly disturbed by the news of his mother"s illness.

　　分词在句子中作状语，使用何种分词，要取决于分词与句子主语的关系：主谓关系用现在分词，动宾或被动关系用过去分词。

　　【例如】

　　Notshavingsenough hands, we turned to them for help.(we don"t have enough hands).

　　Taught by mistakes and setbacks, we have become wiser and handled our affairs better. (we are taught/teach us) . Inspired by the International, the working people of all countries have been fighting for their final liberation³. (the working people were inspired/ inspire the working people)____the earth to be flat, many feared that Columbus would fall off the edge. (CET-4 1996,6)

　　A)Havings believed B) Believing C) Believed D) Being believed

　　本句意思为：相信地球是平的，许多人担心哥伦布会从边上掉下去。许多人与相信之间是主谓关系，及分词与主语之间为主谓关系。因此，应用现在分词，答案为B.

　　No matter how frequently ____, the works of Beethoven always attract large audiences. (CET-4 1995,6)

　　A) performing B) performed C) to be performed D) being performed

　　本句中贝多芬的作品被反复表演，可见分词与句子的主语之间是被动关系，应该用过去分词，故答案为B.

　　____as it was at such a time, his work attracted much attention. (CET-4 1996,1)

　　A) Being published B) Published C) Publishing D) To be published

　　本句中as引导的是让步状语从句，意思为：他的作品尽管在被这样的时候出版，还是引起了关注，可见分词与句子的主语之间是被动关系，应该用过去分词，故答案为B.

　　2)“while ( when, once, until, if , though等连词)+分词”结构现在分词或过去分词作状语时，有时可以在分词前加while，when, once, although, until, if等连词。

　　【例如】

　　When leaving the airport, she waved again and again to us.While waiting for the train, I had a long talk with my sister about her work..

　　Once recovered, he threw himselfsintoshis work and made every effort to do it well.

　　Although working very hard, he failed to pass the final exam.If translated word by word, the passage will be difficult to understand.

　　3)分词作定语分词作定语时，单个的分词通常放在被修饰的名词之前，分词短语一般置于所修饰的中心词后面。现在分词修饰的是发出该动作的名词(即与名词有主谓关系)，过去分词修饰承受该动作的名词(即与名词是动宾关系)。

　　【例如】

　　We will go on with our experiment as soon as we get the added fund.

　　This is really an exhausting day to all of us!

　　We can see the part of the moon lighted by sunlight.

　　After a night spent in excitement and sleeplessness⁴, I forced myself to take a long walk along the beach the next day.

　　More and more developing countries established strategic⁵ partnership⁶ with developed countries.

　　The young sitting between my sister and my brother is my cousin Jack⁷..

　　As early as 1649 Ohio made a decision that free, tax-supported schools must be established in every town ____50 households or more. (CET-4 1998,1)

　　A) having B) to have C) to have had D) having had

　　后面由分词做定语，而且town本身有50或以上人家，故town与分词间为主谓关系，应该用现在分词，答案为A。

　　4)分词作宾语补足语现在分词在see, watch, hear, observe, notice, feel, find, glimpse, glance等感官动词和look at, listen to等短语动词以及have, keep, get, catch, leave, set, start, send等使役动词后面与名词或代词构成复合宾语，作宾语补语的成分。

　　【例如】

　　On the top of the hill, we could see smoke rising from the chimneys in the village.

　　The little boy sat beside the railway line and watched the trains roaring by.

　　We should not leave him wondering what he should do.

　　I am sorry to have kept you waiting for such a long time.

　　I caught him dozing⁸ off in class.

　　过去分词可以在allow, ask, consider, desire, expect, feel, find, get, have, hear, imagine, keep, like, make, observe, order, permit, prefer, remember, request, require, see, urge动词等后面作宾语补足语。

　　【例如】

　　After my encounter with her, I found myself greatly shaken.You should keep her informed of what is going on here.The teacher expected the students well prepared for the examination.

　　在动词see, hear, feel, watch, notice，perceive，observe, listen to, look at后既可用现在分词做补语,也可用不定式做补语。用现在分词表示动作正在进行,用不定式表示的动作的全过程已经完成。

　　【例如】

　　I saw Mr. White get off a bus.

　　I saw Mr. White lookingsintosa shop window.

　　——Do you hear someone knocking at the door?

　　——Yes, I did. I heard him knock three times.

　　5)分词作表语分词作表语通常看作形容词来用。现在分词表示主语的性质，而且主语多为物;过去分词表示主语的感受或状态，主语多为人。

　　【例如】

　　The film“Pearl Harbor”is really exciting. I am excited about it.

　　His response to the question was quite disappointing. I felt disappointed at his response.

1 stems   

n.（花草的）茎( stem的名词复数 )；词干；（高脚酒杯的）脚；烟斗柄v.遏制[阻止]（液体的流动等）( stem的第三人称单数 )；封堵；遏止

参考例句：

• The present wave of strikes stems from discontent among the lower-paid. 当前的罢工浪潮起因于低工资雇员们的不满情绪。 来自《简明英汉词典》
• Her interest in flowers stems from her childhood in the country. 她对花卉的兴趣产生于她在乡下度过的童年时代。 来自《简明英汉词典》

2 depressed   

adj.沮丧的，抑郁的，不景气的，萧条的

参考例句：

• When he was depressed,he felt utterly divorced from reality.他心情沮丧时就感到完全脱离了现实。
• His mother was depressed by the sad news.这个坏消息使他的母亲意志消沉。

3 liberation   

n.解放，解放运动（为获得平等权利和地位的行为）

参考例句：

• We should help those who are still struggling for liberation.我们应当帮助那些仍在为独立而斗争的人们。
• Many people died during famines every year before liberation.解放前每年有许多人在饥荒中死亡。

4 sleeplessness   

n.失眠，警觉

参考例句：

• Modern pharmacy has solved the problem of sleeplessness. 现代制药学已经解决了失眠问题。 来自《简明英汉词典》
• The doctors were puzzled by this strange continuous sleeplessness. 医生们对他的奇异的不眠感到疑惑。 来自英语晨读30分（高三）

5 strategic   

adj.战略（上）的，战略上重要的

参考例句：

• The army moved for strategic reasons.军队作了战略转移。
• The bridge is of strategic importance to us.这座桥对我们至关重要。

6 partnership   

n.合作关系，伙伴关系

参考例句：

• The company has gone into partnership with Swiss Bank Corporation.这家公司已经和瑞士银行公司建立合作关系。
• Martin has taken him into general partnership in his company.马丁已让他成为公司的普通合伙人。

7 jack   

n.插座，千斤顶，男人；v.抬起，提醒，扛举；n.（Jake）杰克

参考例句：

• I am looking for the headphone jack.我正在找寻头戴式耳机插孔。
• He lifted the car with a jack to change the flat tyre.他用千斤顶把车顶起来换下瘪轮胎。

8 dozing   

v.打瞌睡,假寐 n.瞌睡

参考例句：

• The economy shows no signs of faltering. 经济没有衰退的迹象。
• He never falters in his determination. 他的决心从不动摇。