Unit 4 A Glimpse of the Future Grammar 课件-2023-2024学年高二英语外研版（2019）选择性必修第三册

Unit 4 Period 2 Grammar 课 堂 学 习 Subject-verb agreement (2) 1 Look at the sentences from the reading passage and answer the questions. a ... 50 per cent of my time was spent researching new restaurants. b Every recommendation she gives me is great... c ... almost 50 per cent of US jobs are at risk from automation in the next 20 years. d ... none of us is prepared for the challenges of AI. 1 Why is 50 per cent singular in sentence (a) but plural in sentence (c)? Because in sentence (a), the part “50 per cent” is followed by the uncountable noun “time” while in sentence (c), the part “50 per cent” is followed by the countable noun “job” in its plural form. 2 What are the subjects in sentences (b) and (d)? Are they singular or plural? In sentence (b), the part “Every recommendation” is the subject. In sentence (d), the part “none of us” is the subject. Both are singular. Now Look for more sentences following this rule in the reading passage, and summarise the use of subject-verb agreement in your own words. 1. Nearly every job is potentially at risk in the long run. 2. The truth is that none of us is prepared for the challenges of AI. 3. I believe most of the value of AI lies in its capacity to analyse and interpret vast amounts of data, which means it can even solve problems that are too challenging for human experts. 【语法讲解】 主谓一致是指主语和谓语在人称和数等方面的一致，当主语是不定代词或含有修饰语时，谓语动词的形式要依据主语所表达的单、复数概念而定，而不仅仅是取决于简单的外在形式。 1）当主语被分数（百分数）、表示量的词汇等修饰时，谓语动词的形式要依据主语本身进行判断，如果主语本身是可数名词单数或者不可数名词，则谓语动词要用单数形式；如果主语是可数名词复数，或主语加上修饰语后整体表达的意义是复数概念，那么谓语动词要用复数形式。 e.g. a. About one-third of the books in the library are donated by students who graduated from the school. 图书馆里大约三分之一的书都是由这所学校的毕业生捐赠的。book是可数名词，在句中是复数形式，并且句中着重于书的数量而不是将书视作整体，因此“三分之一的书”表达的意义是复数概念，谓语动词用are。 b. Around 10 per cent of the forest is destroyed each year. 每年大约有10%的森林被毁。 本句中的the forest 为可数名词的单数形式，泛指森林，因此“10%的森林”视作一个整体，谓语动词用is。 c. A large number of people have applied for the job. 许多人都申请了这份工作。 本句中的peopl