高中英语名词性从句讲解

名词性从句（NOUNCLAUSES）主语从句、表语从句、宾语从句和同位语从句在复合句中的作用相当于名词。因此，着四种从句被称为名词性从句。1宾语从句（THEOBJECTCLAUSE）宾语从句在复合句中起宾语的作用，可以做动词的宾语，也可以做介词的宾语。引导宾语从句的词有连词THAT,IF,WHETHER连接代词WHO,WHOSE,WHAT,WHICH连接副词WHEN,WHERE,HOW,WHY等。如ITHINKTHATWOMENCANREACHVERYHIGHACHIEVEMENTSINMANYFIELDSOFSCIENCEIWONDERIF/WHETHERLINQIAOZHIREMEMBEREDHOWMANYBABIESSHEHASDELIVEREDDOYOUKNOWWHO/WHOMJOHNADAMSWASSPEAKINGTOHEASKEDWHOSESPACESUITITWASPAYATTENTIONTOWHATTHEDOCTORSAID,WILLYOUHECANTTELLWHICHGESTUREMEANS“GOODLUCK”PLEASETELLMEWHENJODYWILLIAMSWONTHENOBELPEACEPRIZEIDONTKNOWWHERECHARLIECHAPLINGOTHISSTICKWILLYOUTELLMEHOWICANKEEPFITANDHEALTHYDOYOUKNOWWHYHECROSSEDHISARMS2表语从句（THEPREDICATIVECLAUSE）表语从句在复合句中做句子的表语。引导表语从句的词有连词THAT,WHETHER,ASIF连接代词WHO,WHAT,WHICH连接副词WHEN,WHERE,HOW,WHY等。如HERWISHISTHATSHECOULDLOSEWEIGHTSOONTHEQUESTIONISWHETHERITISWORTHDOINGITLOOKEDASIFITWASGOINGTOSNOWTHEPROBLEMWASWHOCOULDDOTHEWORKTHATISWHATHEISWORRIEDABOUTHISTROUBLEISWHEREHECANFINDANEWJOBTHEPROBLEMISHOWHECANGETFOODANDCLOTHINGTHATWASWHYTHEBROTHERSWANTEDTOMAKEABET3主语从句主语从句在复合句中做句子的主语。引导主语从句的词有连词THAT,WHETHER连接代词WHO,WHAT,WHICH连接副词WHEN,WHERE,HOW,WHY等。如WHATISNEEDEDFORTHESPACETRIPISCAREFULPREPARATIONWHETHERWILDLIFECANBEWELLPROTECTEDISOFGREATIMPORTANCEWHOWILLGOMAKESNODIFFERENCESWHYDINOSAURSDIEDOUTREMAINSAPUZZLEWHICHKINDOFFOODISTHEBESTISSTILLNOTCERTAIN为了避免主语显得过长，可以用IT作为句子的主语，把主语从句移到句子的末尾。如ITHASNTBEENDECIDEDYETWHENTHENEWRESTAURANTWILLOPENITISNOTCLEARHOWGOLDWASFOUNDTHE