现在分词和过去分词的用法
1)As Lily missed the bus, she was late for the class.
Missing the bus, she was late for the class.
2)As the student was scolded by the teacher, she felt unhappy.
scolded by the teacher, she felt unhappy.
1、现在分词
(一)现在分词的定义:
现在分词Present Participle(又称-ing形式、现在进行式) ,是分词的一种,由动词原形+ing形式组成。具有双重性,一面具有动词的特征,可以有自己的宾语和状语;另一面具有形容词和副词的特征,可以充当表语,定语,状语,补足语,可以表示主动或正在进行的动作,是非谓语动词的一种。
(二)现在分词的功能与用法:
1. 作定语
单个分词作定语时放在所修饰的名词前,分词短语作定语时放在后,并且名词与现在分词之间存有逻辑上的主谓关系。一般都可以转化为一个进行时的定语从句。
e.g.arunningboyaboywhoisrunning
an old manstandingtherean old manwhoisstandingthere
例如:
The report indicated that 45% of students were in jobs not  specific qualifications.
A. requiring          B. to be required        C. being required      D. to have required
2. 作补语
  只有两类动词可以加现在分词作宾补:
1)感官动词seehearwatchfeelnoticeobservefindlisten tolook at
2)使役动词havegetmake
  注意:要想用现在分词来作宾补,只能是用于这些词后,但是并不代表这些动词后的宾补形式都要用现在分词(有些后面可以加不带to的不定式作宾补)。
eg.I saw Thomasplaying computer games.
Don’t have the students studying all day.
  注意:宾语与作宾补的现在分词之间存在逻辑上的主谓关系,即宾语是现在分词动作的发出者。
3. 作表语
(1) 分词作表语有两种情况,一种是现在分词作表语,一种是过去分词作表语,究竟是用现在分词还是用过去分词作表语是学生们经常困惑的地方。一般来说,表示心理状态的动词如exciteinterest等都是及物动词,汉语意思不是激动高兴,而是使激动使高兴,因而现在分词应该是令人激动的令人高兴的,过去分词则是感到激动的感到高兴的
。所以,凡表示令人……都是-ing形式凡是表示感到……”都用-ed形式。这类词常见的有:
interesting 使人感到高兴— interested感到高兴的
exciting令人激动的— excited感到激动的
delighting令人高兴的— delighted感到高兴的
disappointing令人失望的— disappointed感到失望的
encouraging 令人鼓舞的— encouraged感到鼓舞的
pleasing令人愉快的— pleased感到愉快的
puzzling令人费解的— puzzled感到费解的
satisfying令人满意的— satisfied感到满意的
surprising令人惊异的— surprised感到惊异的
worrying令人担心的—worried感到担心的
  如:Traveling is interesting but tiring.
The pupils will get confused if they learn too much at a time.
如果让学生学得太多,他们会感到糊涂的。
4. 作状语
现在分词作状语多表示时间、条件、原因、让步、结果、方式、伴随等。
思考题1请将下列句子中的现在分词短语转化为相应的状语从句:
Walking in the street,I saw him. (时间状语)
Working hard,you will succeed.  (条件状语)
Being ill,she stayed at home.    (原因状语)
Having failed many times,he didn’t lose heart. (让步状语)
His parents died,leaving him an orphan. (结果状语)
Please answer the question using another way.  (方式状语)
He entered the classroom, taking a book in his hand. (伴随状语)
注意:有些惯用的分词短语在句中可以没有逻辑上的主语而独立存在:
generally speaking一般来说 Judging from/by ……判断出
strictly speaking 严格来说 roughly speaking  大致来说
narrowly speaking  狭义上说          broadly speaking广义上说
(三)现在分词的独立主格
独立主格结构Independent Genitive)有两部分组成,前一部份是名词或者代词,后一部分是谓语动词(suggest的名词不定式、动名词和分词)或形容词、副词、或介词短语。前后两部分具有逻辑主谓关系。独立主格结构在句中做状语,多用于书面语。 独立主格结构本身不是句子,在句子中作状语,表示时间、原因、条件、伴随、目的等。
e.g.Winter comingit gets colder and colder.(it在句中指代的是天气
Weatherpermitting,we will go outing this weekend.
思考题2请将以上两个句子中的独立主格结构改为相应的状语从句。
(四)现在分词的时态与语态:
时态语态
主动式
被动式
一般式
doing
being done
完成式
having done
having been done
现在分词的一般式:
  (1) 现在分词的一般式通常表示其动作与谓语动词的动作同时发生。如:
  She sat there reading a novel.
  (2) 现在分词的一般式所表示的动作有时在谓语动词的动作之前发生。如:
Going into the roomhe shut the door. 走进房间,他就关上了门。
现在分词的完成式:
  现在分词的完成式表示其动作在谓语动词的动作之前完成。
Having finished her homework, the little boy began to watch TV.
  做完作业后,这个小男孩开始看电视。
现在分词的被动式:
现在分词的被动式表示其逻辑主语为现在分词动作的承受者。
(1) 现在分词的一般被动式。如:
  The building being built is our library.
(2) 现在分词的完成被动式。如:
Having been told many times, he still did not know how to do it.
  (人家)已经告诉他多少次了,他还是不知道怎么做。
思考题3请将下列两个句子中的现在分词短语改为相应的定语从句或状语从句。
1. The question being discussed is of great importance.
2. Having been warned by the teacher, the students didn’t make such mistakes.
例如:
1.________in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.
A. To wait B. Have waited C. Having waited D. To have waited
2.According to a recent U.S. survey, children spent up to 25 hours a week ______TV.
A. to watch B. to watch C. watching D. watch
3.The flu is believed _______ be viruses that like to reproduce in the cells inside the huma
n nose and throat.
A. causing B. being caused C. to be caused D. to have caused
4.The flowers ______ sweet in the botanic garden attract the visitors to the beauty of nature.
A. to smell B. smelling C. smelt D. to be smelt
5.Dont leave the water ______ while you brush your teeth. 
A. run B. running C. being run D. to run
6.They see you as something of a worrier, ______ problems which dont exist and crossing bridges long before you come to them.