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课件网) Unit 4 A glimpse of the future Using Language Grammar Learning objectives 1. To know subject-verb agreement on person and number; 2. To use subject-verb agreement correctly. Observe the rules Activity 1 Look at the sentences and answer the questions. a ... 50 per cent of my time was spent researching new restuarants. 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) 2 What are the subjects in sentences (b) and (d) Are they singular or plural 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), “Every recommendation” is the subject. In sentence (d), “none of us” is the subject. Both are singular. Subject-verb agreement 定义：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。 Subject-verb agreement 用法归纳 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，具体如下： 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是复数概念，那么谓语动词要用复数形式。 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； 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。 About one-third of the books in the library are donated by students who graduated from the school. 每年大约有10%的森林被毁。 Around 10 per cent of the forest is destroyed each year. 1) Fifty percent of the students in our school ____ girls. 2) Three-fourths of the surface of the earth ____ sea. 3) Over sixty percent of the city _____ destroyed in the war. are is was Practice 用法归纳 2：常用的表示“量”的短语后面接名词的谓语情况。 1) a number of / a variety of / varieties of +可数名词复数作主语时，谓语动词用复数形式。 2) a large amount of +不可数名词，谓语动词用单数； large amounts of +不可数名词， 谓语动词用复数。 A number of new houses have been built there. A variety of products are on sale now. A large amount of money was spent on the bridge. Large amounts of money were spent on the bridge. 用法归纳 3：当主语被不定代词修饰或主语本身是不定代词时，谓语动词的形式需要根据主语加上修饰语后整体表达的意义来进行判断。 所有方法都试过了，却没有什么效果。 Every means has been tried out without much result. 1) Each boy _____ a prize. 2) Many of us _____ gone through regular training. 3) Every possible approach ____ been tried, but in vain. 4) Both of the instruments ____ not precise ones. 5) Something ___ going to happen, and nobody can stop it from happening. have ha ... ...
