上海洛基国际英语--------本科学、专科高级英语——重点语法剖析系列二E:Networkcaneasilycontactwithfriends,buthavelesstimetospendwithourlovedones.Wereducedthecommunicationbetweenthelovedones.Whatdoyouknowaboutallergy?Andthenpleasetalkaboutsomeinfectiousillnessandhowtostayhealthy.Allergyisasubstanceoftheimmunesystemcausedbyimproperreaction,undernormalcircumstances,thismaterialisharmless.Theimmunesystemishighlycomplexdefensemechanism4.不定式做状语不定式做状语主要表示目的、程度、结果、方式。(1)inorderto(do),soasto(do)结构引导目的状语，soasto不能置于句首。如：Tosucceedinascientificresearchproject,oneneedstobepesistent.Iadvisethemtowithdrawsoasnottogetinvolved.(2)so…asto,such…asto,enough…to,too…to结构做程度状语。如：Thesolutionworksonlyforcoupleswhoareself-employed,don’thavesmallchildrenandgetalongwellenoughtospendmostoftheirtimetogether.ThevocabularyandgrammaticaldifferencesbetweenBritishandAmericanEnglisharesotrivialandfewashardlytobenoticed.(3)不定式做结果状语只能出现在句子的末尾，表示不愉快的结果，有时用only加强语气。常见的不定式动词有find,hear,see,betold,form,give,make,produce等。如：Greatlyagitated,Irushedtotheapartmentandtriedthedoor,onlytofinditlocked.(4)not/nevertoo…to,too…notto,but/onlytoo…to,tooready/eager/apt/inclinedto表示肯定意义。如：Iamonlytoopleasedtohearfromyoufurther.能再听到你的消息，我太高兴了。三、动名词1.必须接动名词做宾语的动词牢记下列要求接动名词做宾语的动词：acknowledge,advocate,anticipate,appreciate,advise,avoid,admit,confess,consider,defend,delay,deny,dislike,enjoy,escape,excuse,fancy,favor,finish,forgive,imagine,include,involve,justify,keepmind,miss,mention,pardon,practice,postpone,permit,report,resent,resume,recall，recollect，risk,resist,suggest,tolerate。如：Althoughateenager,Fredcouldresistbeingtoldwhattodoandwhatnottodo.Iappreciatehavingbeengiventheopportunitytostudyabroadtwoyearsago.2.动名词做介词短语考生尤其要识别下列短语中的to是介词，不是不定式符号：objectto,resortto,reactto,contributeto,lookforwardto,beaccustomedto,becommittedto,beexposedto,besubjectedto,bedevotedto,bededicatedto,beopposedto,bereconciledto,becontraryto,be(get)usedto,comecloseto,getdownto,giveoneselfupto,prefer…to,seeto,setto,taketo,inadditionto,withregardto,withaviewt