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1、Unit3GrammarandusageLinkingverbsForthesereasons,IbelievetheInternetremainsapositivetoolthathelpsmakeourlivesbetter.TheamountoffalseinformationontheInternetbecomesmoreofaproblemeveryday.TheseareallnegativeeffectstheInternethasonourlives,andIfeelitremainsimportantforuseithertolimitouruseo
2、ftheInternet,ortolearnhowtohandletheproblemsithascaused.Wecalltheredwords——linkingverbs.Alinkingverbisawordusedtoconnectthesubjectofasentencetofurtherinformationaboutthestatewhichthesubjectisin.Themostcommonlinkingverbis“tobe(be/am/is/are/was/were/been)”.Whatarelinkingverbs?连系动词（即系动词）用于
3、连接主语和表语，说明主语的状态，性质，特征或身份。常见的系动词是be动词,它的变化形式为：am/is/are/was/were/been.除了be动词之外还有一些，他们大致可分为四类：1.感官系动词:look(看起来)，feel(摸上去)，seem(似乎是)，appear(似乎、显得)，smell(闻起来)，taste(尝起来)，sound(听起来)等。例如:Thestorysoundstrue.Thoseorangestastegood.2.状态系动词:表示某种情况或状态的持续。这类系动词强调“持续”。常见的有:remain(依然)，keep(保持)，stay(保持
4、)，stand(处于某状况或情形)等。例如:—Whydon'tyouputthemeatinthefridge?—Itwillstayfreshforseveraldays.It'salreadyteninthemorning.Thestoreremainsclosed.What'sthematter?3.变化系动词:表示由一种情况或状态变化成另一种情况或状态。这类系动词强调“变化”后的情况或状态。常见的有:become(变成)，turn(变成)，grow(变得)，go(变得)等。例如:Putthefishinthefridge,oritwillgobadinhotw
5、eather.3.结果系动词：prove，turnout（结果是，被证明是）eg.Whathesaidproves(tobe)right.1.系动词通常不用于被动语态和进行时态中。如:feel，taste等词。例如:—Doyoulikethematerial?—Yes,itfeelsverysoft.2.一般情况下，系动词主要跟形容词或分词作表语。例如:Becarefulwhenyoucrossthisverybusystreet.Ifnot,youmaygetrunoverbyacar.注意事项3.能跟名词作表语的系动词常见的有:be,become,appear,s
6、eem,prove,remain和turn等。注意:turn后跟(表示主语身份的)名词作表语时，不加冠词。例如:Twentyyearslater,heturnedteacher.ThepopulationgrowthinChinaremainsaproblem.4.系动词也可跟不定式(todo/tobe)，常见的有:appear,seem,remain,prove,look等。例如:Havingatripabroadiscertainlygoodfortheoldcouple,butitremainstobeseenwhethertheywillenjoyit.Ont
7、helongjourney,Peterprovedtobeamostinterestingguide.Weallhadawonderfultime.常见连系动词的用法总结：1.seemseem(tobe)+表语seemtohavedonesth.seemtobedoingsth.seem+从句2.becomebecome+noun.become+adj.become+v-ed/ing3.growgrow+adj.growtodosth.growinto(=become)It’sgrowingcolderatnightnow.Igrewtoliketh
