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1、Unit 1 Science and ScientistsLearning about Language2023-2024学年高二英语人教版（2019）选择性必修第二册课前导学一、 课前预习名词性从句表语从句表语从句是在复合句中作表语的名词性从句，放在连系动词之后，一般结构是“主语连系动词表语从句”。可以接表语从句的连系动词有 be, look, remain, seem等。1.连接词类别连接词例句从属连词that不作句子成分，也没有意义，通常不可省略My suggestion is that you should have patience. 我的建议是你应该有耐心。whether 不作句子
2、成分，但有“是否”的意义，一般不用if代替The question is whether we can cut down the costs of the product. 问题是我们能否降低产品成本。because, as if/through等He has to watch his weight.That is because he has heart disease.他不得不注意自己的体重，那是因为他有心脏病。It sounds as if someone is knocking at the door. 听起来好像有人在敲门。连接代词who, whom, whose, what, wh
3、ich, whoever, whatever, whichever等。在从句中作主语、宾语、表语或定语The problem is who can complete the difficult task. 问题是谁能完成这项困难的任务。This is just what we are always looking forward to. 这正是我们一直盼望着的。连接副词when, where, why, how等。在从句中作状语That is where he was born and brought up. 那就是他出生和被养大的地方。Their difficulty is how they
4、 can clear their debts. 他们的困难是怎样才能还清债务。2. 需要注意的问题as if/though 引导的表语从句的语气as if/though 引导的表语从句常置于连系动词look, seem, appear, sound, feel 等后。若表述真实的情况，就用陈述语气；若表述与客观事实相反的假设，则用虚拟语气。It seems as if he benefits a lot from the project.看起来好像他从这个项目中获益不少。 (陈述语气）It looks as if/though he were drunk.他看上去好像喝醉了。 (虚拟语气）表语
5、从句的特殊句式（The reason why. . .is that. . . 的原因是 (why引导定语从句，修饰 the reason, that引导表语从句）This/That/It is because . . . 这那是因为 (because引导表语从句，从句表原因）This/That/It is why . . . 这那就是的原因。 (why引导表语从句，从句表结果）The reason why he didnt come is that he didnt receive the invitation. 他没来的原因是他没有收到请柬。The woman was weeping bi
6、tterly. Thats because her son was drowned in a river. 那位女士痛哭流涕，那是因为她的儿子在河中溺亡了。 (先果后因）The womans son was drowned in a river. Thats why she was weeping bitterly. 那位女士的儿子在河中溺亡了，那是她痛哭流涕的原因。 (先因后果） 表语从句中的虚拟语气主语是表示“建议、命令、要求”的名词，如 suggestion, advice, proposal, order, command, request, requirement, demand 等
7、时，表语从句应使用虚拟语气，即从句谓语用“should+动词原形”，should可以省略。My suggestion is that we (should) set off early tomorrow.我的建议是我们明天早点儿动身。His order was that all boys gather quickly around the car. 他的命令是所有男孩子要速在汽车周围集合。二、自我检测1._ (confuse) about the varieties of organic food, I seemed at sea which to choose.2.The exact pla
8、ces the police marked on the map were _ the suspected murderer had lived.3.It is _ the CPCs leadership that China has become the worlds second largest economy.4.During winter, people should eat some hot food to benefit the body and defend _ the cold weather.5.A quarrel broke _ last Sunday, and he br
9、oke away from his family.6.The person who is _ charge of the factory has been sick since last week.7.It is said that the special class consists of some _(gift) children.8.The virus was _(initial) believed to be a common one, but with more cases reported, it proved wrong.9.Peter, as well as his _(ass
10、ist), Lily, was performing a chemical experiment yesterday afternoon, but I dont know whether they have finished it.10.What the doctors really doubt is _ my mother will defeat the serious illness.答案及解析1.答案：Confused解析：句意为:由于对各种各样的有机食品感到困惑,我不知道该选什么好。此处应用形容词作状语,意为“感到困惑的”,故填confused。2.答案：where解析：句意为:警察在
11、地图上标出的确切地点是谋杀案嫌疑犯居住过的地方。_ the suspected murderer had lived是表语从句,连接词在从句中作地点状语,意为“的地方”,应用where。3.答案：under解析：句意为:在中国共产党的领导下,中国已经成为世界第二大经济体。under ones leadership意为“在领导下”。故填under。4.答案：against/ from解析：句意为:在冬季,人们应该吃一些热的食物,这样有益于身体,还能抵御寒冷的天气。defend against/ from意为“抵御”。故填against/ from。5.答案：out解析：break out为固定搭
12、配,意为“突然发生;爆发”。6.答案：in解析：in charge of为固定搭配,意为“负责”。7.答案：gifted解析：句意为:据说这个特殊的班是由一些有天赋的孩子组成的。设空处修饰children,应填形容词,意为“有天赋的”,故填gifted。8.答案：initially解析：修饰动词应用副词,作状语。故填initially。9.答案：assistant解析：句意为:彼得和他的助手莉莉昨天下午做了一个化学实验,但我不知道他们是否做完了。设空处应填名词,意为“助手”,故填assistant。10.答案：whether解析：句意：医生们确实没有把握的是我的母亲是否能战胜这种严重的疾病。根据句意可知，空处表示是否，故应填whether。版权所有正确教育 侵权必究！