causeandeffect英语说明文写作中的因果关系

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1、CauseEffect Presenter:ShellDate:1st,AprilQuestions with why are often asked and answered.Why?Definition Words and phrasesOrganize paragraphrelationshipCause and EffectCause&EffectTell readers why something happenedTell readers the results of somethingCause Effect effectsTherefore soas a result,conse

2、quentlyaccordinglybecause of thisThus.hencefor this reasonresult in causesdue to because ofowing to as a result of on account of foron the ground ofThrough Because since ason the ground thatTransitional Words and Phrases therefore,consequently,as a result,and for this reason 通常后面接逗号 The weather was

3、cold;therefore,Sally closed the window.The weather was cold.Therefore,Sally put on her coat.The weather was cold.Consequently,Sally put on her scarf.A blizzard hit the town.As a result,the schools were closed.Since,because 置于表示原因的句子前，句后用逗号.Because the weather outside was cold,Sally closed the window

4、.so 前面的句子后加逗号 The weather was warm,so Jim turned on the air conditioner.There are two ways of organizing paragraphs developed by cause and effectTo state an effect and devote the rest of the paragraph to examining the causesTo state a cause and then mention or predict the effectsExample:what are the

5、 reasons for the increasing rate of car accidents?Example:what are the results of American population getting older?According to official statistics,more than 10,000 people in the country were killed in car accidents last year.The increasing rate of car accidents can be attributed to three general c

6、auses.Mechanical problems of cars,such as faulty brakes,bald tires,and flat tires,contribute to the high rate of car accidents.Environmental problems,such as blind corners,narrow streets,heavy fog,slippery roads cause a significant number of disasters.Such errors of human problems as excessive speed

7、 and drunken driving are considered the major factor of the fatal accidents.If drivers had been careful,many needless slaughters in car accidents could have been avoided.The topic sentence indicates that the paragraph focuses on the causes.A recent census reported that the American population is rap

8、idly getting older.The aging of the nation will bring about serious effects.The most obvious effect is perhaps an economic one:how will the country bear the cost of caring for too many old people?The old are considerably more expensive to maintain.They now live mainly at home and need more services,

9、and medical costs at present are almost twice the bill for people under 65.To support the old,the social-security system already pays more than it receives,and within a matter of four years,it will not be able to help the retired.Then,to keep the system going,working Americans will simply have to wo

10、rk harder and receive less pay.Effect 1:taking care of the old costing more money Effect 2:the social security system losing money Effect 3:working Americans working harder but getting less pay Four patterns of cause-effect relationshipnSingle-cause-single-effect patternnSingle-cause-many-effects pa

11、tternnMany-causes-single-effect patternnCausal chain patterncause1cause2cause3effect1effect2effect3What is the cause of air pollution?Whats the effects of smoking?Exhaust gas from carsUncontrolled factory gassesBurning of low quality coalAir pollutionSmoking Do harm to peoples health Often cause fir

12、esWaste moneyCasual ChainJims father has a bad temper,and he often beats Jims mother and the kids.(family violence)Jims mother leaves Jims father,taking the children with her.With only Jims mothers income,the family has less money,so the family experiences financial problems.Jims mother moves in wit

13、h her boyfriend to help the family finances.Jim feels unwanted in his new home and runs away.a homeless childcauseeffect(cause)effect(cause)effect(cause)effectthe most immediate effectHow to writePractice Sample&LOGO How to write cause-and-effect paragraphv Sound Reasoning or logic When discussing c

14、auses and effects,make sure your analysis is of logic.You must not take it for granted that event A causes event B simply because event A occurs before event B.In other words,you must explain clearly what really brings about a particular LOGOvPossible Shift in order In cause-and-effect writing,it se

15、ems convenient to state the effect first and then analyze the causes.The reverse order,however,is to be preferred when one cause leads to a number of effects.Topic Sentence-It should tell what to be discussed in the paragraph;-It should also indicate whether the focus of the paragraph is on the caus

16、e or the effect.If you stay with Tom for a day,you will know why he is gaining weight.(cause)2.Although the American Civil War turned many brothers and sisters into enemies,it solved some big political and economic problems of the country.(effect)3.A lack of essential vitamins can result in serious

17、illness.(effect)4.There are three reasons why I want to stay in a small town.(cause)Topic sentence:I play table tennis for three reasons.I.Sub-topic sentence:Its easy fun.1.Have known the rules for a long time;2.Not dangerous.II.Sub-topic sentence:It relaxes me.1.Enjoy playing with friends;2.A good break from studies.III.Sub-topic sentence:It allows me to meet new people.1.Travel to other places for games;2.Compete with students from other facultiesHomework:analyze the causes of one of your hobbies?