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1、Unit4DiscoveringusefulwordsandexpressionsReadthetextandpayattentiontotheusefulphrases.Review1.向四面八方2.及时，终于3.冷却；平静下来4.与……不同5.依赖……；决定于……6.（除...…之外）也，又7.成长为，渐成，变为inalldirectionsintimecooldownbedifferentfromdependonaswellasgrowinto8.下蛋9.产生，分娩10.轮到某人，接着11.阻止……12.逃离；从……漏出13.作为
2、...…的结果，由于layeggsgivebirthtoinone’sturnprevent…fromescapefromasaresultofA、名词后缀有-er,-or,-ist,-ment,-sion,-tion,-ness等B、形容词后缀有-able,-ive,-ful,-ish,-less,-like,-ian等C、形容词前缀有un-,im-,in,ir-,il-,non-等D、动词前缀有dis-，mis-，re-等E、动词后缀有-ise/ize，-en等在词根上加上词缀（前、后缀）可以构成一个新词，这种构词法叫派生法。Giv
3、esomewordswithprefixorsuffix.as在这里表示原因，意思是“因为”Ashewasill,heneededmorehelp.1.Nooneknowsexactlyhowtheearthbegan,asithappenedsolongago.没人明白他在说什么，因为那太难理解了。Nooneseeswhathe’ssaying,asitistoohard.because, as, since与for(1)because表示原因的语气较强，回答why问句的提问。如果原因不重要，或为人所知，一般用as或since。(2)
4、for表示原因的语气较because弱，类似补充说明，一般不用来回答why提出的问题。引导的从句不能放在句首，而且前面一般用逗号与主句分开。1._____youcan’tanswerthequestion,perhapswe’dbetterasksomeoneelse.2.Pleasebebrief_______Iaminahurry.3.Myheadaches______wantofsleep.4.Itmusthaverainedlastnight,______thegroundiswetthismorning.5.Cyprus,__
5、_youknow,isanislandintheMediterranean.Fillintheblankswithas,because,fororsince.Sincebecauseforforas2.Whatitwastobecomewasuncertainuntilbetween4.5and3.8billionyearsagowhenthedustsettledintoasolidglobe.这里的betodo表示可能性Areyoutopaythedebtforyourwife?Thelovelydogisnowheretobefo
6、und.年轻时，他不知道自己以后会举世闻名。Asayoungman,hedidn’tknowhewastoworld-famouslateron.3.Theywereintimetoproducecarbon,nitrogen,watervapourand…Shewillbebackintimetopreparedinner.intimetodosth./forsth.来得及……Theywerejustintimeforthebus.我们正好赶上了早班车。Wewereintimetocatchtheearlybus.on time按时，
7、准时Hewillcomeontimeeventhoughitrains.intime及时；迟早Firemenreachedthehouseonfireintime.Intimeshewillwin.完成句子：1)我们到达车站时，刚好赶上那班车。Wegottothestationjust___________catchthebus.2)他早晚会明白什么才是对的。__________hewillseewhatisright.intimetoIntime3)我刚好来得及赶上那班飞机。Iwasjust_____________theflight
8、.4)大夫正好及时赶到挽救了他的生命。Thedoctorgottherejust______________hislife.intimeforintimetosaveat times时常kill time消
