原因状语从句

状语从句分类1.表示时间2.表示原因3.表示结果4.表示目的5.表示让步6.表示比较7.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because(1)because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：Whycan’tIgo?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Thereasonwhy…isthat…如：Thereasonwhyhecannotcomeisthatheisill.because后跟句子IwaslateforschoolbecauseIgotuplate.becauseof后跟名词Wedidn’tgotothecinemabecauseoftherain.关于sincesince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,you’dbettertakeataxi.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：•so•so...that，•such...thatSo因此It’sgoingtorain,sotakeanumbrellawhenyougoout.Heworkedtoohard,sohefellillagain.so....that如此......以致于1.so+形／副＋thatHewassogladthathecouldn’tsayaword.Thehallissobigthatitcanhold2,000people.Motherlivessofarawaythatwehardlyeverseeher.2.so+形容词＋a(an)＋可数名词单数＋thatHeissogoodaboythateveryteacherlikeshim.Itissoheavyaboxthatthelittleboycan’tcarryit.3.so＋many/few/much/little＋复名(不可名)+thatSoonthereweresomanypeoplethattheyateallthefood.Hehassolittletimethathecan’tgotothecinemawithyou.可数名词不可数名词such…that“如此的…以致于”表结果。1.such＋a(an)＋形＋可数名词名词单数＋thatMrGreenissuchagoodteacherthateverybodylikeshim.Itwassuchaninterestingfilmthateveryonelaughed.•2.such＋形容词＋复数名词／不可数名词•＋thatOurtownhassuchfreshairthateveryvisitorwantstocome.•1.so+形／副＋that2.so+形容词＋a(an)＋单数名词＋that3.so＋many/few/much/little＋复数名词(不可名)+thatSo强调的是形容词•such…that“如此的…以致于”表结果。1.such＋a(an)＋形＋可数名词单数＋that2.such＋形＋复数名词／不可数名词＋that•Such强调的是名词1.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.so…that/such…thatsotiredthatfellasleepsuchaninterestingsofastthatsomuchwork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•Theyarehurryinginorderthattheymaynotmissthetrain•Heworkshardsothathecangetgoodgrades.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，although•evenif，eventhoughthough,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./;if2.ThisTVsetistoodear,____itgivesyouabetterpicture.A.orB.andC.ifD.though3.____heisveryyoung,____heknowsseverallanguageA.Though;butB.Because;soC.Though;/D.Because;/CDC4.Hewas____tired____hecouldn’tgoonworking.A.too;toB.such;thatC.so;thatD.too;that5.Shewas____wealllikeher.A.suchagoodsingerB.suchagoodsingerthatC.averygoodsingerthatD.sogoodsingerthatCB7.Itwas____wewentfishingintheopenairyesterday.A.suchaniceweatherB.soniceweatherthatC.suchniceweatherthatD.aniceweathersothatC