连系动词,它本身有词义,但不能单独用作谓语,后边必须跟表语(亦称补语),构成系表结构说明主语的状况、性质、特征等情况。表语通常由名词、形容词,或相当于名词或形容词的词或短语等充当,说明主语是什么或怎么样。一连系动词的类型有1."存在"类:表示存在或具有某种特征或状态.这类连系动词强调"存在"。常见的有:be(是),look(看起来),feel(摸上去),seem(似乎是),appear(似乎、显得),prove(证明是),smell(闻起来),taste(尝起来),sound(听起来)等。例如:Thestorysoundstrue.Thoseorangestastegood.2."持续"类:表示某种情况或状态的持续。这类连系动词强调"持续"。常见的有:remain(依然),keep(保持),stay(保持),continue(继续、仍旧),stand(处于某状况或情形)等。例如:Whydon'tyouputthemeatinthefridge?Itwillstayfreshforseveraldays.It'salreadyteninthemorning.Thestoreremainsclosed.What'sthematter?3."变化"类:表示由一种情况或状态变化成另一种情况或状态。这类连系动词强调"变化"后的情况或状态.常见的有:become(变成),turn(变成),grow(变得),get(变得)等。例如:Putthefishinthefridge,oritwillgobadinhotweather.根据连系动词的意义,可分为四类:1五大感官系动词2状态系动词3动态系动词4双谓语系动词二注意事项1.有些连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,连系动词主要跟形容词或分词作表语。例如:Becarefulwhenyoucrossthisverybusystreet.Ifnot,youmaygetrunoverbyacar.3.能跟名词作表语的连系动词常见的有:be,become,appear,seem,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.连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.Onthelongjourney,Peterprovedtobeamostinterestingguide.Weallhadawonderfultime.表语是用来说明主语的身份、性质、品性、特征和状态的,表语常由名词、形容词、副词、介词短语、不定式、动词的-ing、从句来充当,它常位于连系动词(be,become,appear,seem等)之后。例子Africaisabigcontinent.非洲是个大洲。Thatremainsapuzzletome.对我来说,那是一个残余的难题。