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1.表示原因 1)Therearethreereasonsforthis. 2)Thereasonsforthisareasfollows. 3)Thereasonforthisisobvious. 4)Thereasonforthisisnotfartoseek. 5)Thereasonforthisisthat... 例如:Therearethreereasonsforthechangesthathavetakenplaceinour life.Firstly,people’slivingstandardhasbeengreatlyimproved.Secondly,mostpeople arewellpaid,andtheycanaffordwhattheyneedorlike.Lastbutnotleast,moreand morepeopleprefertoenjoymodernlife. 2.表示好处 1)Ithasthefollowingadvantages. 2)Itdoesusalotofgood. 3)Itbenefitsusquitealot. 4)Itisbeneficialtous. 5)Itisofgreatbenefittous. 例如:Booksarelikefriends.Theycanhelpusknowtheworldbetter,andthey canopenourmindsandwidenourhorizons.Therefore,readingextensivelyisofgreat benefittous. 3.表示坏处 1)Ithasmoredisadvantagesthanadvantages. 2)Itdoesusmuchharm. 3)Itisharmfultous. 例如:However,everythingdividesintotwo.Televisioncanalsobeharmfulto us.Itcandoharmtoourhealthandmakeuslazyifwespendtoomuchtimewatching televi-sion. 4.表示重要、必要、困难、方便、可能 1)Itisimportant(necessary,difficult,convenient,possible)forsb.todosth. 2)Wethinkitnecessarytodosth. 3)Itplaysanimportantroleinourlife. 例如:Computersarenowbeingusedeverywhere,whetherinthegovernment, inschoolsorinbusiness.Soon,computerswillbefoundineveryhome,too.Wehave goodreasontosaythatcomputersareplayinganincreasinglyimportantroleinour lifeandwehavesteppedintotheComputerAge. 5.表示措施 1)Weshouldtakesomeeffectivemeasures 2)Weshouldtryourbesttoovercome(conquer)thedifficulties. 3)Weshoulddoourutmostindoingsth. 4)Weshouldsolvetheproblemsthatweareconfronted(faced)with. 例如:Thehousingproblemthatweareconfrontedwithisbecomingmoreand moreserious.Therefore,wemusttakesomeeffectivemeasurestosolveit. 6.表示变化 1)Somechangeshavetakenplaceinthepastfiveyears. 2)Agreatchangewillcertainlybeproducedintheworld’scommunications. 3)Thecomputerhasbroughtaboutmanychangesineducation. 例如:Somechangeshavetakenplaceinpeople’sdietinthepastfiveyears.The majorreasonsforthesechangesarenotfartoseek.Nowadays,moreandmorepeople areswitc