原因状语从句.ppt

状语从句分类,表示时间表示原因表示结果表示目的表示让步表示比较表示条件,一:原因状语从句定义：如果从句表达的是主句行为的原因，就构成原因状语从句。引导词：because,since,as,for,关于becausebecause表示的原因是必然的因果关系，语气最强，通常放在主句之后，有时也放在主句之前。YouwanttoknowwhyIamleaving?IamleavingbecauseIamtired.(2)回答why提出的问题，只能用because,不能用其余三者。A：WhycantIgo?B：Becauseyouaretooyoung.,(3)because从句可用作表语，其余不能。Thisisbecausetheearthistravellingaroundthesun.(4)表示“的原因是因为”这一意义时，一般要用Thereasonwhyisthat如：Thereasonwhyhecannotcomeisthatheisill.,because后跟句子IwaslateforschoolbecauseIgotuplate.becauseof后跟名词Wedidntgotothecinemabecauseoftherain.,关于since,since引导的原因状语从句一般放于主句之前,表示已知的、显然的理由(通常被翻译成“既然”)，较为正式,语气比because弱。Sinceyouarefreetoday,youhadbetterhelpmewithmymaths.既然今天你休息，你最好帮我补习数学。,关于asas引导原因状语从句时表示附带说明的“双方已知的原因”，语气比since弱，较为正式，位置较为灵活(常放于主句之前)。Asitisraining,youdbettertakeataxi.既然在下雨，你最好乘出租汽车。Iwenttobedearly,asIwasverytired.我睡得早，因为我筋疲力尽了。,For“因为,由于”表明附加或推断的理由，引导的分句前常有逗号。for分句不放句首.Itrainedlastnight,forthegroundiswetthismorning.,注意：汉语习惯上说“因为所以”，但英语却不能将because,since,as,for等与so(所以)连用。,二：结果状语从句,定义：表示由某个行为而导致的结果引导词：soso.that，such.that,So因此Itsgoingtorain,sotakeanumbrellawhenyougoout.Heworkedtoohard,sohefellillagain.,so.that如此.以致于,1.so+形副that,Hewassogladthathecouldntsayaword.Thehallissobigthatitcanhold2,000people.Motherlivessofarawaythatwehardlyeverseeher.,2.so+形容词a(an)可数名词单数thatHeissogoodaboythateveryteacherlikeshim.Itissoheavyaboxthatthelittleboycantcarryit.,3.somany/few/much/little复名(不可名)+that,Soonthereweresomanypeoplethattheyateallthefood.Hehassolittletimethathecantgotothecinemawithyou.,可数名词,不可数名词,2019/12/14,15,可编辑,suchthat“如此的以致于”表结果。,1.sucha(an)形可数名词名词单数that,MrGreenissuchagoodteacherthateverybodylikeshim.Itwassuchaninterestingfilmthateveryonelaughed.,2.such形容词复数名词不可数名词that,Ourtownhassuchfreshairthateveryvisitorwantstocome.,1.so+形副that2.so+形容词a(an)单数名词that3.somany/few/much/little复数名词(不可名)+thatSo强调的是形容词suchthat“如此的以致于”表结果。1.sucha(an)形可数名词单数that2.such形复数名词不可数名词thatSuch强调的是名词,她是如此的疲惫，以致于很快就睡着了。Shewas_she_quickly.2.这是一本非常有趣的小说，以致于我读了三遍。Itwas_novelthatreaditthreetimes.3.他跑得非常快，没人能追上他。Heruns_nobodycancatchupwithhim.4.玛丽有如此多的工作要做，以致于她整天呆在办公室。Maryhad_todothatshestayedatherofficeallday.,sothat/suchthat,sotiredthat,fellasleep,suchaninteresting,sofastthat,somuchwork,三：目的状语从句,定义：从句表达的是主句行为的目的主要的引导词有:sothat，inorderthat，,Theyarehurryingsothattheymaynotmissthetrain.他们匆匆忙忙目的是为了不错过火车TheyarehurryinginorderthattheymaynotmissthetrainHeworkshardsothathecangetgoodgrades.,Heworkshardinorderthathecangetgoodgrades.,Sothat引导的目的状语从句中常常含有情态动词can,could,may,might,Would,should,区分Inorderthat+句子Sothat+句子Inordertodosthtodosth,四：让步状语从句,表示尽管.引导词:though，althoughevenif，eventhough,though,although,though,although在句首表“尽管”两者都可以用。不能与but连用。下列情况只能用though：asthough(=asif);好像evenif(=eventhough)即使在句末表示“然而”,1._therearetoomanypeoplehere,_wehavetofindanotherhouse.A.Because;soB.Though;butC.Since;/D./;if,2.ThisTVsetistoodear,_itgivesyouabetterpicture.A.orB.andC.ifD.though,3._heisveryyoung,_heknowsseverallanguageA.Though;butB.Because;soC.Though;/D.Because;/,C,D,C,4.Hewas_tired_hecouldntgoonworking.A.too;toB.such;thatC.so;thatD.too;that,5.Shewas_wealllikeher.A.suchagoodsingerB.suchagoodsingerthatC.averygoodsingerthatD.s