(2021新外研版)高中英语选择性必修四 Unit 3 The world meets China Using languageppt课件.pptx
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1、Using language 一一、条件状语从句条件状语从句 1.引导条件状语从句的常见从属连词(短语)有: if、unless、as/so long as、in case (万一)、once、on condition that、 provided/providing (that)、supposing/suppose (that)、assuming that (假设)等。 Youll fail the exam unless you study hard. They agreed to lend us the car on condition that we returned it befor
2、e the weekend. My parents dont mind what job I do as long as I am happy. Adverbial clauses 2.only if和if only的区别 only if意为“只有”,置于句首时主句的主谓要用部分倒装。 if only意为“但愿;要是就好了”,引导的从句要用虚拟语气:与现在的 情况相反时,从句用一般过去时;与过去的情况相反时,从句用过去完成 时;与将来的情况相反时,谓语用“would/could+动词原形”。 Only if he studies harder can he catch up with othe
3、rs. If only it would stop raining! 二二、让步状语从句让步状语从句 1.although、though、as与while引导的让步状语从句 Although he is considered a great writer , his works are not widely read. Although this may sound like a simple task , great care is needed. while也可以引导让步状语从句,但只能放在句首,意为“虽然;尽管”。 While he loves his students , he is
4、very strict with them. 2.even if与even though引导的让步状语从句 even if与even though表示“即使,纵然”,引导让步状语从句时,可用 虚拟语气,也可以用陈述语气。 Ill do it , even if it takes me all afternoon. Even if I were in your place , I wouldnt take the job. 3.“疑问词+-ever”引导的让步状语从句 however、whatever、whoever、whenever等引导的让步状语从句相 当于“no matter+疑问词”,意
5、为“无论”。 Wherever/No matter where you go , I would keep you company. 4.whether.or.引导的让步状语从句 Whether or not he will stay , I really dont care. 三、时间状语从句 1.when、while和as引导的时间状语从句 连词含义用法 when当时候 可与延续性动词或非延续性动词连用;从句动作可 以发生在主句动作之前、之后或与主句动作同时发 生 while当时候 只可与延续性动词连用;侧重于主句动作与从句动 作相对比 as 一边一 边;随着 常与延续性动词连用;从句动作
6、与主句动作同时或 几乎同时发生 Researchers in Britain found that when French music was played , sales of French wines went up. While watching TV , children do not merely absorb words and images. As he grew older , he became less active. 如果主句表示的是非延续性动作,而从句用延续性动词的进行时态表 示在一段时间内正在进行的动作,则when、while与as可互换使用。 When/While/
7、As I was walking down the street , I came across an old friend. 2.表示“一就”含义的词或短语引导的时间状语从句 (1)有的名词短语或副词可引导时间状语从句,如:the moment、the minute、the second、the instant、immediately、directly、 instantly等。另外as soon as也可引导时间状语从句,从句中用一般时态 代替将来时态。 For example , the moment you get on the airplane , start adjusting yo
8、ur biological clock to the destinations time. The boy ran off the minute he saw the owner of the orchard. (2)在hardly/scarcely.when.和no sooner.than.结构中,主句用过去完 成时,than或when所在的从句用一般过去时。 I had hardly told him the news when he stopped listening. He had no sooner finished his speech than the students star
9、ted cheering. 在hardly/scarcely.when.与no sooner.than.结构中,当hardly , scarcely或no sooner位于句首时,主句要用部分倒装。 They had hardly reached Edinburgh when they were ordered to return to London. =Hardly had they reached Edinburgh when they were ordered to return to London. 3.till,until和not.until/till的用法 until与till两者
10、均表示“直到为止”,引导时间状语从句。 肯定句中,其主句谓语动词必须为延续性动词,表示某动作一直延续到 某时间为止。 not.until.与not.till.两者均表示“直到才”,not所在的主句的 谓语动词必须为非延续性动词,表示某动作直到某时间才开始。until 可用于句首,而till不可放在句首,till一般不用于强调句型。 The father waited until his daughter finished her homework. The baby didnt go to bed until/till his mother returned. 4.after、before引导
11、的时间状语从句 after表示“在之后”;before表示“在之前;还没来得及就”。 He changed his name after he left his hometown. Before modern medicine changed the laws of nature , many children died of common childhood diseases. 5.since引导的时间状语从句 since意为“自从以来”,从句的谓语动词一般是非延续性动词,主 句的谓语动词一般是延续性动词。since从句的时态若是一般过去 时,主句常用现在完成时或现在完成进行时。 They
12、have been friends since they met for the first time in London. It has been three years since the war ended. 6.其他常见名词短语引导的时间状语从句 every time每次、each time每次、any time任何时候、next time下次、the first/last time第一次/最后一次。 Every time I meet her I always forget her name. The first time I met her , I thought her nice
13、 and honest. 四四、原因状语从句原因状语从句 1.原因状语从句通常由because、since、as、now that等连词引导。 连词 区别 位置内涵能否回答why问句能否被强调 because主句前或后直接原因能能 as(由于)主句前或后 双方都知 道的原因 否否since/now that(既然) 主句前 Now that youve got a chance , you might as well make full use of it. We had better hurry as its getting dark. 2.seeing that.(由于;鉴于)、consi
14、dering that.(考虑到;鉴于)也可 引导原因状语从句。 Seeing (that) the weather is bad , well stay at home. Considering (that) it is handmade , the price seems reasonable. 五五、地点状语从句地点状语从句 地点状语从句可由where、wherever和everywhere引导。 You should make it a rule to leave things where you can find them again. Everywhere they went ,
15、the distinguished guests were warmly welcomed. where既可以引导定语从句,也可以引导地点状语从句。引导定语 从句时,从句前应该有一个表示地点的名词作先行词,where可以 变为“介词+关系代词”形式;而状语从句前则没有先行词。 Put the book at the place where you took it.(定语从句) Put the book where you took it.(状语从句) 六六、结果状语从句结果状语从句 引导结果状语从句的从属连词有:so that(因此)、so.that.(如此以 至于)、such.that.(如
16、此以至于)等。 so.that.与such.that.引导结果状语从句的结构形式为: so+形容词/副词+that从句 so+形容词+a/an+可数名词单数+that从句 so+many/much/few/little(少)+名词+that从句 such+a/an+形容词+可数名词单数+that从句 such+形容词+可数名词复数/不可数名词+that从句 such+a lot of/lots of+名词+that从句 在so.that.和such.that.结构中,当“so+adj./adv.”或“such+n.” 置于句首时,主句要部分倒装。 So fast did he run that
17、 I couldnt catch him. He is so experienced a worker that we all believe him. =He is such an experienced worker that we all believe him. 七七、目的状语从句目的状语从句 1.in order that与so that引导的目的状语 两个短语都意为“以便;为了”,其引导的状语从句中谓语应用 “could/should/might/would+动词原形”。in order that比so that正式, 其引导的状语从句可置于主句之前或之后;而so that引导的从
18、句只能置于 主句之后。 Speak louder so that/in order that the people in the hall can all hear you. In order that we might get there on time , we should set out early. 2.for fear that(唯恐)与in case(以防)引导的目的状语从句 Leave your key with your neighbour in case you lock yourself out one day. 八八.比比较状语从句较状语从句 比较状语从句一般位于句尾,
19、常用 as.as、not as/so.as、比较级+than引导。 He is taller than any other student in our school. John plays football as well as , if not better than , David. 九九、方式状语从方式状语从句句 引导方式状语从句的从属连词有:as(正如,按照)、as if/though as if或as though引导的从句与事实相反时,通常用虚拟语气:与现在事实 相反时,从句用一般过去时;与过去事实相反时,从句谓语用“had+过去分 词”;与将来事实相反时,从句谓语用“would
20、/could/might+动词原形”。从 句内容与事实相符或可能成为事实时,则用陈述句语气。 Please do as the teacher tells you to do. They treat her as though she were their daughter. Look at the clouds! It looks as if it is going to rain. 选词填空 as long as ,in case , so that , as though , even though , now that 1.Dad brought a notebook along to
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