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1、TheComma(,)lThecommaordinarilyindicatesapausewithinasentence.lWhenhecame,Iwasbusycleaningmyroom.lHowever,sometimescommasarerequiredbythestructureofasentence,evenwherenopauseinnecessary.l1.Acommaisusedinacompoundsentencebeforetheconjunctionorconnective(and,but,or,for,so,nor,oryet).?Heaskedthequestio
2、ninaloudvoice,butnooneanswered.?Weweretired,andwedecidedtohavearest.?Comeearly,oryou'llmisstheshow.?Shecouldn'tgototheairporttomeethim,norcouldshesendanyoneinherstead.?Itmusthaverainedlastnight,forthegroundiswet.?Heisaneccentricboy,yetyoucan'thelplikinghim.l2.Acommaisusedafteranadverbialclauseorphr
3、ase(includingaprepositionalphraseandaparticipialphrase)beforethesubjectofthesentenceorinthemiddleofthesentence.?Whenthebellrang,theteacherdismissedtheclass.?Intheancientpalace,theysawthethronewhereemperorsusedtosit.?Toseetheimportanceofthisrailway,onehastolookatamap.?BornandbroughtupintheSouth,shei
4、snotusedtoeatingwheat.?Theandience,interestedinthetopic,askedthespeakermanyquestions.l3.Commasareusedtoseparateaseriesofwordsorphraseshavingthesamefunctioninthesentence:?Thelittlegirllikestosing,todance,andtoact.?Shebuysbread,butter,vegetables,andmanyotherthingsfromthissupermarket.4.Nonrestrictivec
5、lausesandphrasesaresetoffbycommas:lHehadtoleavehishometown,wherehehadlivedeversincehewasborn.lDr.Li,thenewchairmanofthedepartment,willspeakatthemeeting.lAnoldlady,noddingandsmiling,invitedusin.5.Commassetoffparentheticalelements:lYourwork,I'msorrytosay,isnotsatisfactory.lTocallaspadeaspade,theexper
6、imentwasafailure.lTheyhavemanycourses:Chinese,English,Mathematics,History,tonamejustafew.6.Indates,acommaisusedtoseparatethedayfromtheyeariftheorderismonth-day-year.lShewasbornonMay24,1979.lcommasareoftenusedtoseparatedigitsbythousands.l319,08723,654,085ThePeriod(.)l1.Theperiod(fullstop)isusedatthe
7、endofadeclarativesentence,amildlyimperativesentence,andanindirectquestion:lEverystudentshouldlearntousethepunctuationmarks.lLearntousethepunctuationmarks.lTheyaskedhowthesemicolonshouldbeused.l2.Theperiodis
