人教版高一英语必修4学案之 句型剖析 ：Unit2　Working the land.doc

二、句型剖析1.for作连接词【典型例句】 i went to see him,for i had something to tell him.我去见他,因为我有事要告诉他。【要点归纳】 for为并列连词,它引导的表原因的并列分句一般放在所要说明的分句的后面,用来附带解释说明其原因或理由。【相关链接】 for与because/since/as辨析:(1)because 是从属连词,接表示直接原因的从句,一般放在主句的后面,也可放在主句前面,它表示的语气最强,在回答why的问句时,必须用because。例如:the swimming pool wont be open today because theyre making repairs.游泳池今天不开放,因为他们在修理。 (2)as 是从属连词,说明一般的因果关系,语气比because 弱,说明比较明显的原因,它引导的从句通常放在句首,有时也可放在句末。例如:as/since it is raining,youd better take a taxi.天下雨了,你最好乘出租车。 (3)since 意为“既然”,表示对方已知的无需加以说明的原因或事实,语气比because弱,但是比as 强。例如:since everybody is here,lets begin our party.既然大家都到了,那就开始我们的聚会吧！2.倍数+as+形容词原级+as【典型例句】 this tree is three times as tall as that one.这棵树是那棵树的三倍高。 his father is twice as old as he.他父亲的年纪有他两倍大。【相关链接】 (1)倍数+计量形容词比较级+than,例如:the yangtze river is almost twice longer than the pearl river.长江差不多比珠江长两倍。 the dictionary is exactly five times more expensive than that one.这本字典比那本恰好贵5倍。(2)倍数+the+计量名词+of,例如:the newly broadened square is four times the size of the previous one.扩建的广场是未扩建时的四倍大。(3)倍数+that+of.例如:the size of the newly broadened square is four times that of the previous one.扩建的广场为以前的四倍大。(4)倍数+the+计量名词,例如:ive paid five times the usual price for the stamp.我出了5倍于往常的价格买这枚邮票。3.would rather 【典型例句】 i would rather have a cup of coffee than a cup of water.我宁愿喝杯水也不愿喝杯咖啡。i would rather not go by car.我宁愿不乘汽车去。i would rather not have attended the physical exam.我宁愿没有参加这次体检。i would rather you posted the e-mail now.我倒是希望你现在就把这封电子邮件寄走。 i would rather you had been there yesterday.我真希望昨天你能在那里。【要点归纳】 (1)would rather do than do.或would do rather than do表示“宁愿而不愿”。表示主语本身与过去的事实相反的愿望时,后接现在完成时。(2)would rather (that)从句用虚拟语气,叙述过去的情况,从句动词用had done；叙述现在和将来的情况,用过去式。4.“疑问词+ever”和“no matter+疑问词”【典型例句】 no matter where you are,i will miss you.(=wherever you are,ill miss you.) 不论你到哪儿,我都会想你的。dont trust him,no matter what he says.(=dont trust him whatever he says.)不管他说什么,都别相信他。whatever you say are always true.(不能换成no matter what)无论你说什么都是对的。【要点归纳】“疑问词+ever”和“no matter+疑问词”都引导让步状语从句。此外,“疑问词+ever”还可引导名词性从句。【相关链接】(1)who和whoever的区别:who引导名词性从句时,意为“谁”,有疑问语气；whoever相当于anyone who.,意为“无论是谁,的任何一个人”。例如:who has taken away my bag is unknown.谁拿走了我的包还不知道。(用whoever句意不通) whoever wants to see this film can go with us tonight.无论谁想看这部电影今晚可以和我们一起去。(whoever wants 相当于anybody who wants,意为“凡是想的人”。这里不可换为who。) (2)what和whatever的区别:what=the thing which;