写作类型：1.现象解释型2.问题解决型3.对比选择型4.观点论证型5.记叙文6.应用文四级作文使用率最高的12个基本句式1．表示原因1）Therearethreereasonsforthis．2）Thereasonsforthisareasfollows．3）Thereasonforthisisobvious．4）Thereasonforthisisnotfartoseek．5）Thereasonforthisisthat．．．6）Wehavegoodreasontobelievethat．．．例如：Therearethreereasonsforthechangesthathavetakenplaceinourlife．Firstly，people’slivingstandardhasbeengreatlyimproved．Secondly，mostpeoplearewellpaid，andtheycanaffordwhattheyneedorlike．Lastbutnotleast，moreandmorepeopleprefertoenjoymodernlife．2．表示好处1）Ithasthefollowingadvantages．2）Itdoesusalotofgood．3）Itbenefitsusquitealot．4）Itisbeneficialtous．5）Itisofgreatbenefittous．例如：Booksarelikefriends．Theycanhelpusknowtheworldbetter，andtheycanopenourmindsandwidenourhorizons．Therefore，readingextensivelyisofgreatbenefittous．3．表示坏处1）Ithasmoredisadvantagesthanadvantages．2）Itdoesusmuchharm．3）Itisharmfultous．例如：However，everythingdividesintotwo．Televisioncanalsobeharmfultous．Itcandoharmtoourhealthandmakeuslazyifwespendtoomuchtimewatchingtelevision.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．WehavegoodreasontosaythatcomputersareplayinganincreasinglyimportantroleinourlifeandwehavesteppedintotheComputerAge．5．表示措施1）Weshouldtakesomeeffectivemeasures．2）Weshouldtryourbesttoovercome（conquer）thedifficulties．3）Weshoulddoourutmostindoingsth．4）Weshouldsolvetheproblemsthatweareconfronted（faced）with．例如：Thehousingproblemthatweareconfrontedwithisbecomingmoreandmoreserious．Therefore，wemusttakesomeeffectivemeasurestosolveit．6．表示变化1）Somechangeshavetakenplaceinthepastfiveyears．2）Agreatchangewillcertainlybeproducedintheworld’scommunications．3）Thecomputerhasbroughtaboutmanychangesineducation．例如：Somechangeshavetakenplaceinpeople’sdietinthepastfiveyears．Themajorreasonsforthesechangesarenotfartoseek．Nowadays，moreandmorepeopleareswitchingfromgraintomeatforprotein，andfromfruitandvegetabletomilkforvitamins．7．表示事实、现状1）Wecannotignorethefactthat．．．2）Noonecandenythefactthat．．．3）Thereisnodenyingthefactthat．．．4）Thisisaphenomenonthatmanypeopleareinterestedin．5）However，that’snotthecase．例如：Wecannotignorethefactthatindustrializationbringswithittheproblemsofpollution．Tosolvetheseproblems，wecanstartbyeducatingthepublicaboutthehazardsofpollution．Thegovernmentonitspartshouldalsodesignstricterlawstopromoteacleanerenvironment．8．表示比较1）ComparedwithA，B．．．2）IprefertoreadratherthanwatchTV．3）Thereisastrikingcontrastbetweenthem．例如：Comparedwithcars，bicycleshaveseveraladvantagesbesidesbeingaffordable．Firstly，theydonotconsumenaturalresourcesofpetroleum．Secondly，theydonotcausethepollutionproblem．Lastbutnotleast，theycontributetopeople’shealthbygivingthemduephysicalexercise9．表示数量1）Ithasincreased（decreased）from．．．to．．．2）Thepopulationinthiscityhasnowincreased（decreased）to800，000．3）TheoutputofJulyinthisfactoryincreasedby15％comparedwiththatofJanuary．例如：Withtheimprovementofthelivingstandard，theproport...
