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1、★itisadvisable,itisdesired,itissuggested,itisrequested,itwasordered,itwasproposed,itisnecessary,itisimportant,ithasbeendecided,itisdesirable,itisessential,itiscrucial,itisvital,itisproper,itisrecommendable等结构后引导的主语从句。Itis+adj.+subjectiveclause在这类从句中，谓语多用should+动
2、词原形或省略should直接用动词原形。现代英语，特别在新闻文字，外交文件，提案等及口语中后一种形式比较普遍，美国人也比较爱用后一种形式。例题Itispolitelyrequestedbythehotelmanagementthatradios______after11o'clockatnight.A)werenotplayedB)notbeplayedC)nottoplayD)didnotplay正确答案为B)。看见request一词，我们马上初步断定这是测试虚拟语气。应该用should+动词原形或直接用动词原形。A
3、ppositiveAconstructioninwhichanounornounphraseisplacedwithanotherasanexplanatoryequivalent,bothhavingthesamesyntactic句法的relationtotheotherelementsinthesentence;forexample,PlatoandtheGreekphilosopherinPlato,theGreekphilosopher,wasbornin427BC.同位语：一名词或一名词词组作为解释性成分与
4、另一个放在一起，这两个成分与句子中的其他成分有相同的关系AppositiveNoun(phrase)astheappositiveAnna,mybestfriend,washerelastnight.PaulJones,thedistinguishedartcritic,diedinhissleeplastnight.Mr.Campbellthelawyerwasherelastnight.Hisonlyinterestinlife,playingfootball,hasbroughthimmanyfriends.He
5、alwaysworkshardinspiteofthefactthatheisnotingoodhealth.同位语所表示的关系相当于连系动词，即可以用be把同位语连接起来。Annaismybestfriend.PaulJonesisthedistinguishedartcritic.Mr.Campbellisthelawyer.Hisonlyinterestinlifeisplayingfootball.Thefactisthatheisnotingoodhealth.NounClauseastheAppositiv
6、ea.用作同位语的名词从句对与它同位的名词进行解释或说明其实际内容，一般由that引导，有时也可用whether，what,when，where，why，how等来引导。Thefactthatseawatercan'tbeusedfordrinkingisknowntoall.b.用在同位语从句前的先行词通常是一个概括性抽象名词:answer,appeal,belief,conclusion,decision,discovery,fact,idea，message,news,promise,proposal,quest
7、ion,remark,reply,report,saying,statement,thought,understanding,truth.Thefactthathewrotealettertohersuggeststhatheknewher.c.带有that-分句作同位语的句子，如果谓语动词及其补足成分较短或同位的主要名词词组带有其他修饰语，则that-分句可与该主要名词词组分隔。例如：Thefactremainsthatthereisnofillingstation(加油站)here.Suddenlythethoug
8、htcametomethathecouldgoblind.AbrahamLincolnisthemostfamousinstanceoftheclaimthatAmericansoftenmadethatintheircountryamanmayrisefromthelowesttothehighestposition.d.tha
