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句子的核心是谓语动词,谓语动词的确定取决于主语。根据句子含义和结构认准主语是掌握主谓一致的必要条件;弄清主谓一致的语言规则和习惯是掌握主谓一致的充分条件,要正确使用主谓一致,两个条件缺一不可,但同学们往往会走入以下三大误区。

误区一 误认主语

1. 倒装句

①Between the two buildings are a big tree. (×)

②Between the two buildings is a big tree. (√)

【解析】第①句谓语动词使用are,错误地认为the two buildings是该句的主语,但实际上是介词between的宾语,一起构成介词短语,而介词短语不能充当主语。该句是一个倒装句,真正主语是a big tree。因此第②句正确。

特别提醒倒装句的常见结构:副词/介词短语+谓语+主语

2. 主语之后带有介词短语

①The fruit like apples , oranges are good for our health. (×)

②The fruit like apples , oranges is good for our health. (√)

【解析】第①句误认为apples , oranges是主语,因此谓语动词用are,而实际上the fruit才是该句的主语,like apples , oranges是介词短语作后置定语修饰the fruit。该句译为“像苹果、桔子之类的水果对我们的身体是有好处的”。因此第②句是正确的。

特别提醒类似的结构有:主语+with / like / except / but / together with / as well as . . . ,谓语动词应与主语一致,而与介词短语之后的名词无关。

3. one of . . . + 名词复数或复数代词

①There are twenty boys in our class. One of the boys are from Canada. (×)

②There are twenty boys in our class. One of the boys is from Canada. (√)

【解析】one of the boys的中心词是one,因此谓语动词用单数,造成第①句错误的原因主要是把the boys当成了该句的主语。

4. 定语从句

①I like the photos which was taken in Beijing. (×)

②I like the photos which were taken in Beijing. (√)

【解析】which were taken in Beijing是一个定语从句,用于修饰先行词the photos,而which本身就代替先行词the photos。因此谓语动词要用复数,造成第①句错误的原因是没有弄清楚关系词which的实质,只是从形式上看它是单数。

特别提醒定语从句中的谓语动词应该与先行词保持一致。

误区二 被主语的表象迷惑

1. 看似复数却表单数概念

①Maths are my favourite subject. (×)

②Maths is my favourite subject. (√)

【解析】maths本身是一个以“s”结尾的单词,而不是一个复数名词,表示单数概念“数学”这一学科,因此第②句正确。

类似的有:physics , news , politics . . .

2. 看似单数却表复数概念

①The police is searching for the robbers. (×)

②The police are searching for the robbers. (√)

【解析】the police译为“警方”,表示复数概念,而不是表示“那个警察”,因此第②句正确,类似的词有:people , the + 形容词,the + 姓 + family等均表复数概念。

3. 名词的单复数同形

①There are a little sheep eating grass on the hill. Can you see it? (×)

②There is a little sheep eating grass on the hill. Can you see it? (√)

【解析】sheep是一个单复数形式相同的名词,由于sheep之前用的a little修饰,加上Can you see it中的it指代单数,因此a little sheep译为“一只小绵羊”,因此第②句正确。如果将原题改为:There ________ (be) a few sheep eating grass on the hill. Can you see them?那又会怎么样呢。

特别提醒类似的单复数形式相同的词还有fish, Chinese, Japanese等,要根据句子的含义和结构暗示来判断其单复数。

4. 集合名词

①Their family is very happy. Now their family is watching TV. (×)

②Their family is very happy. Now their family are watching TV. (√)

【解析】family是一个集合名词,表示整体概念时谓语用单数,表示个体概念时谓语用复数。该句译为“他们全家很幸福,现在全家人正在看电视”。因此第一个family表示整体概念,译为“家庭”,第二个family表示个体概念,译为“家人”,第②句正确。

特别提醒类似的还有group, class, team等既可表单数也可表复数。

误区三 误用语言规则

1. 表示时间、距离、金钱、重量、数量等名词作主语

①Ten years are quite a long time. (×)

②Ten years is quite a long time. (√)

【解析】表示时间、距离、金钱、重量、数量等名词的复数作主语时看作一个整体,谓语动词要用单数,容易错误理解为复数而出现第①句的错误。

2. 由and连接的并列主语

①The twentieth lesson and last lesson are very easy for students. (×)

②The twentieth lesson and last lesson is very easy for students. (√)

【解析】the twentieth lesson and last lesson是表示同一概念,译为“第20课即最后一课”,因此谓语动词应该用单数。同学们容易错误理解“第20课和最后一课”,如果表示两课,应该表达为“the twentieth lesson and the last lesson”。

特别提醒由and连接的并列主语表示同一概念时,谓语动词用单数,表示不同的概念时谓语动词用复数。

3. 就近原则

①Neither you nor he have been to Beijing. (×)

②Neither you nor he has been to Beijing. (√)

【解析】neither . . . nor连接的并列主语(you , he)虽然表示两个人,但根据语言规则,当它连接并列主语的时候,谓语动词根据就近原则,该由he决定,因此第②句正确。

特别提醒类似的还有either . . . or, not only . . . but also, not . . . but, 以及there be之后的并列主语,谓语动词的确定都根据“就近原则”。

4. this kind of, a piece of, this pair of等短语作主语

①This pair of trousers are very new, but Tom’s trousers are very old. (×)

②This pair of trousers is very new, but Tom’s trousers are very old. (√)

【解析】trousers作主语时,谓语动词用复数,但当它被this pair of修饰时谓语动词由pair的单复数确定。因此第②句正确。

特别提醒this kind of, a piece of, a bag of, a box of等,这类短语作主语时谓语动词的单复数由这些短语中的名词决定,而与它们所修饰的名词无关。

5. the rest of,half of等短语作主语

①Half of the students have finished most of the work. The rest of it are very difficult. (×)

②Half of the students have finished most of the work. The rest of it is very difficult. (√)

【解析】根据句意和句子结构可以判断the rest of it中的it,指the work,而work是不可数名词,因此第②句正确。

特别提醒all of, most of, half of, the rest of,以及a lot of, some, any+名词作主语时,要根据后面的名词确定谓语动词的单复数。

6. 一句话提示

①合成不定代词(如something,anybody等)作主语,谓语动词用单数;

②动名词、不定式、从句作主语时,谓语动词用单数;

③a number of + 名词(复)作主语,谓语用复数,the number of + 名词(复)作主语,谓语用单数;

④none of . . . 作主语时,谓语动词可用单数,也可用复数。

金题精练

根据句意,从所给出的选项中选出最佳答案。

1. The news _____ very worth listening to.

A. beB. isC. areD. am

2. —_____ this pair of glasses yours?

—No. My glasses _____ on the desk.

A. Is, isB. Are, isC. Is, areD. Are, are

3. The old _____ taken good care of in China now.

A. wasB. are C. is D. were

4. Nobody except the twins ___ to Hongkong before.

A. have beenB. have gone

C. has been D. has gone

5. —What’s on the plate?

—There _____ some rice on it.

A. is B. are C. has D. have

6. Five years _____ since we met last.

A. have passedB. has past

C. has passed D. have pasted

7. Here _____ some flowers for you.

A. is B. are C. hasD. have

8. There __________ a number of teachers, but the number of women teachers ________ only thirty.

A. are, are B. are, is C. is, are D. is, is

9. Not only my uncle but also my parents _______ I am right.

A. think B. thank C. thinks D. are thinking

10. Doing morning exercises _____ good for our health.

A. beB. are C. isD. am

11. Everyone likes people who _____ ready to help others.

A. isB. areC. beingD. was

12. The Smith family _____ making dumplings in the kitchen.

A. isB. are C. has beenD. can

13. One third of the population in our city ______ farmers in the past.

A. are B. wereC. isD. was

14. The headmaster and the teacher ______ coming to us now.

A. areB. is C. willD. am

15. Tom as well as his friends _____ skating every Saturday.

A. are B. isC. goD. goes

(Keys: 1. B2. C3. B4. C5. A6. C7. B8. B9. A10. C11. B12. B13. B14. A15. D)

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