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1、be-型虚拟式的主要用法如下。用于表示命令、决定、建议等词语之后的that-分句中be-型虚拟式的这一用法又有以下三种情况：a)用在decide,decree,demand,insist,moveorder,prefer,propose,recommend,request,require,suggest,vote等动词之后的that分句中。例如：Heorderedthatallthebooksbesentatonce.Weproposethatsomebodyneutraltakethechair(担任主席)。Sheinsistedthatshegototheso
2、uthforherholiday.Congresshasdecided/voted/decreedthatthepresentlawbemaintained.Thedoctorinsistedthathenoteatmeat.b)用在decision,decree,demand,Instruction,order,requirement,resolution等名词之后的that-分句中。例如：Theboard(理事会)hasgiveninstructionsthattheagentflytoBoston.Wewerefacedwiththedemandthatth
3、istaxbeabolished.Youradvicethatshewaittillnextweekisreasonable.Theirdecisionwasthattheschoolremainclosed.Hisorderthatthetroopsnotbesentatoncewascarriedout.在这一用法中be-型虚拟式能与“should+不定式”交替使用，也能与不定式被动语态交替使用。例如：Heorderedthatthebooksbesentatonce.=Heorderedthatbooksshouldbesentatonce.=Heorder
4、edthebookstobesentatonce.Itisimportantthatshebeplacedinanappropriatejob.=Itisimportantthatsheshouldbeplacedinanappropriatejob.=Itisimportantforhertobeplacedinanappropriatejob.be-型虚拟式能用于由if,though,whatever,lest,solongas等引导的分句中表示推测、让步、防备等含义。例如：Ifhebefoundguilty,Johnshallhavethetightofap
5、peal.Iftherumourbetrue,everythingispossible.Thougheveryonedesertyou,IwillnotWhateverbehisdefense,wecannottoleratethisdisloyalty.Solongasavolumeholdtogether,Iamnotdisturbedastoitsouterappearance.Whethersheberightorwrong,shewillhavemyunswervingsupport.Quietlywesatontheriverbanklestthefi
6、shswimaway.上述用法现在只限于正式书面语体，在非正式语体中通常用动词陈述式或者用should/may+不定式。例如：Iftherumouristrue,everythingispossible.Hehidhimselfinthebushlestheshouldbeseen.Whateverhisdefensemaybe,wecan'ttoleratethisdisloyalty.用于某些公式化的语句中be-型虚拟式用于某些公式化语句中可表示祝愿、诅咒、禁止等意义。例如：LonglivethePeople'sRepublicofChina!Godble
7、ssyou!Heavenforbid!（天理不容)Deviltakehim!(混蛋)Sobeit.(但愿如此/就这样吧。)Sufficeittosaythat...(只需说……就够了。)Farbeitfrommeto(我极不愿)spoilthefun.Hewillremainhereifneedbe.Homeishome,beiteversohomely.语法----倒装英语句子的语序通常是主语在前，谓语在后，这种语序称作正常语序或自然语序。但有时出于语法或达到某种修辞目的(强调、承上启下、平衡等)的需要，要把谓语动词放在主语前面，这种语序称作倒装(Inversi
8、on)语序
