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1、Doyouthinkyouknowhowtousepunctuationmarks?Partner：HuixinzhangHualisunYaliwang逗号的用法(comma)1.在并列连词（and,but,for,nor,or,yet）前使用，用来连接句中的各分句。Onemoleculeofsulphuricacidcontainstwoatomsofhydrogen,oneatomofsulphur,andfouratomsofoxygen.2.逗号用来分隔与句子其他部分密切相连的简短插入语或旁白。Researchintocatalys
2、ishasbeenstimulatedbythemeedsoftheindustryand,inturn,better,moreefficientcatalystshavebeendiscovered.逗号的用法(comma)3.用逗号来分隔一系列单词、词组和从句。Thechemicalengineermustworkcloselywithmechanical,electrical,civil,andmetallurgicalengineersinordertodesignandoperatethephysicalequipmentinapl
3、ant.4.在并列形容词，即分别修饰同一个名词的形容词之间使用逗号，但也有的形容词之间不加逗号的。Combinatorialchemistryisoneoftheimportantnewmethodologiesdevelopedbyacademicsandresearchersinthepharmaceutical,agrochemical,andbiotechnologyindustriestoreducethetimeandcostsassociatedwithproducingeffective,marketable,andcompe
4、titvenewdrugs.逗号的用法(comma)5.用逗号来分隔非限定性修饰语，即该修饰语对于句子的意义并非必不可少。(1)同位语Aboutaquarterofallproductionworldwidegoesintovinylchloride,themonomerformakingPVC.(2)从句Thechemicalindustrytodayisaverydiversesectorofmanufacturingindustry,withinwhichitplaysacentralrole.(3)副词短语和从句Bytheway,di
5、dyouhearaboutSue’scar?句号的用法(afullpoint)用以表示一个句子的结束。Thechemicalindustry’sinterestinpolymersdatesbacktothe19thcentury.2.用在缩写中。省略词一般加句号，如：Mr.Mrs.Ms.B.A.p.m.。B.C.istheprovincelocatedontheWestCoast.问号的用法(afullpoint)1.一个文句涉及多项时，各项之后皆可打问号：Didshebuybutter?milk?eggs?apples?books?2.放
6、在括号中的问号表示不能肯定它前面的那个词、数字或日期的准确性：Theauthorofthisstrangebookwasbornin1078(?)anddiedin1135.冒号的用法(colon)1.列举一系列对等成分However,theycanbedividedintofourclasses:centrifugalpumps,reciprocatingpumps,rotarypumpsandspecialpumps.2.用于主副标题间Chemistry:ASciencefortheTwenty-FirstCentury.3.常用于“as
7、follows”,“thefollowing”Theeconomicadvantageswillvarydependingonthefollowingfactors:fluidviscosity,density,andchemicalreactivity.冒号的用法(colon)4.将冒号置于动词及其补语或宾语之间是不正确的。Thefourstepsintheprocedureareobservation,analysis,documentation,andrecommendation.(notThefourstepsintheprocedu
8、reare:…)1.分断并列复合句，此时不需并列连词Forthesereasons,crystalsizedistribution(CSD)mustbeunderc
