在英語句子里，謂語受主語支配，其動詞必須和主語在人稱和數(shù)上保持一致，這就叫主謂一致。尋其規(guī)律，大致可歸納為三個(gè)原則，即語法一致、邏輯意義一致和就近一致原則。
（一）語法一致原則：語法上一致就是謂語動詞和主語在單、復(fù)數(shù)形式上保持一致。
1、以單數(shù)名詞或代詞、動詞不定式短語、動名詞短語或從句作主語時(shí)，謂語動詞一般用單數(shù)形式；主語為復(fù)數(shù)時(shí)，謂語動詞用復(fù)數(shù)形式。如：His father is working on the farm. / To study English well is not easy. / What he said is very important for us all. / The children were in the classroom two hours ago. / Reading in the sun is bad for your eyes.
注意：由what引導(dǎo)的主語從句，后面的謂語動詞多數(shù)情況用單數(shù)形式，但若表語是復(fù)數(shù)或what從句是一個(gè)帶有復(fù)數(shù)意義的并列結(jié)構(gòu)時(shí)，主句的謂語動詞用復(fù)數(shù)形式。如：What I bought were three English books. / What I say and do is (are) helpful to you.
2、由連接詞and或both … and連接起來的合成主語后面，要用復(fù)數(shù)形式的謂語動詞。如：Lucy and Lily are twins. / She and I are classmates. / The boy and the girl were surprised when they heard the news. / Both she and he are Young Pioneers.
注意：① 若and所連接的兩個(gè)詞是指同一個(gè)人或物時(shí)，它后面的謂語動詞就應(yīng)用單數(shù)形式。如：The writer and artist has come.; / ② 由and連接的并列單數(shù)主語前如果分別有no, each, every more than a (an) , many a (an)修飾時(shí)，其謂語動詞要用單數(shù)形式。如：Every student and every teacher was in the room.. / No boy and no girl likes it.
3、主語為單數(shù)名詞或代詞，盡管后面跟有with, together with, except, but, like, as well as, rather than, more than, no less than, besides, including等引起的短語，謂語動詞仍用單數(shù)形式；若主語為復(fù)數(shù)，謂語用復(fù)數(shù)形式。如：Mr Green, together with his wife and children, has come to China. / Nobody but Jim and Mike was on the playground. / She, like you and Tom, is very tall.
4、either, neither, each, every 或no +單數(shù)名詞和由some, any, no, every構(gòu)成的復(fù)合不定代詞，都作單數(shù)看待。如：Each of us has a new book. / Everything around us is matter.
注意：① 在口語中當(dāng)either或neither后跟有“of+復(fù)數(shù)名詞（或代詞）”作主語時(shí)，其謂語動詞也可用復(fù)數(shù)。如：Neither of the texts is (are) interesting. ② 若none of后面的名詞是不可數(shù)名詞，它的謂語動詞就要用單數(shù)；若它后面的名詞是復(fù)數(shù)，它的謂語動詞用單數(shù)或復(fù)數(shù)都可以。如：None of us has (have) been to America.
5、在定語從句時(shí)，關(guān)系代詞that, who, which等作主語時(shí)，其謂語動詞的數(shù)應(yīng)與句中先行詞的數(shù)一致。如：He is one of my friends who are working hard. / He is the only one of my friends who is working hard.
6、如果集體名詞指的是整個(gè)集體，它的謂語動詞用單數(shù)；如果它指集體的成員，其謂語動詞就用復(fù)數(shù)形式。這些詞有family, class, crowd, committee, population, audience等。如：Class Four is on the third floor. / Class Four are unable to agree upon a monitor.
注意：people, police, cattle等名詞一般都用作復(fù)數(shù)。如：The police are looking for the lost child.
7、由“a lot of, lots of, plenty of, the rest of, the majority of + 名詞”構(gòu)成的短語以及由“分?jǐn)?shù)或百分?jǐn)?shù)+名詞”構(gòu)成的短語作主語，其謂語動詞的數(shù)要根據(jù)短語中后面名詞的數(shù)而定。如：There are a lot of people in the classroom. / The rest of the lecture is wonderful. / 50% of the students in our class are girls.
注意： a number of“許多”，作定語修飾復(fù)數(shù)名詞，謂語用復(fù)數(shù)；the number of“…的數(shù)量”，主語是number，謂語用單數(shù)。
8、在倒裝句中，謂語動詞的數(shù)應(yīng)與其后的主語一致。如：There comes the bus./ On the wall are many pictures. / Such is the result. / Such are the facts.
（二）邏輯意義一致原則：邏輯意義一致就是謂語動詞的數(shù)必須和主語的意義一致（因有時(shí)主語形式為單數(shù)，但意義為復(fù)數(shù)；有時(shí)形式為復(fù)數(shù)，但意義為單數(shù)）。
1、what, who, which, any, more, all等代詞可以是單數(shù)，也可是復(fù)數(shù)，主要靠意思來決定。如：Which is your bag? / Which are your bags? / All is going well. / All have gone to Beijing.
2、表示“時(shí)間、重量、長度、價(jià)值”等的名詞的復(fù)數(shù)作主語時(shí)，謂語動詞通常用單數(shù)形式， 這是由于作主語的名詞在概念上是一個(gè)整體，如：Thirty minutes is enough for the work.
3、若英語是書名、片名、格言、劇名、報(bào)名、國名等的復(fù)數(shù)形式，其謂語動詞通常用單數(shù)形式。如： “The Arabian Nights”is an interesting story-book.
4、表數(shù)量的短語“one and a half”后接復(fù)數(shù)名詞作主語時(shí)，其謂語動詞可用單數(shù)形式（也可用復(fù)數(shù)。如：One and a half apples is (are) left on the table.
5、算式中表示數(shù)目（字）的主語通常作單數(shù)看待，其謂語動詞采用單數(shù)形式。如：Twelve plus eight is twenty. / Fifty-six divided by eight is seven.
6、一些學(xué)科名詞是以 –ics 結(jié)尾，如：mathematics, politics, physics 以及news, works等，都屬于形式上是復(fù)數(shù)的名詞，實(shí)際意義為單數(shù)名詞，它們作主語時(shí)，其謂語動詞要用單數(shù)形式。如：The paper works was built in 1990. / I think physics isn’t easy to study.
7、trousers, glasses, clothes, shoes, 等詞作主語時(shí)，謂語用復(fù)數(shù)，但如果這些名詞前有a (the) pair of等量詞修飾時(shí)，謂語動詞用單數(shù)。如：My glasses are broken. / The pair of shoes under the bed is his.
8、“定冠詞the + 形容詞或分詞”，表示某一類人時(shí)，動詞用復(fù)數(shù)。
（三）就近一致原則：在英語句子中，有時(shí)謂語動詞的人稱和數(shù)與最近的主語保持一致。
1、當(dāng)兩個(gè)主語由either … or, neither … nor, whether … or …, not only … but also連接時(shí)，謂語動詞和鄰近的主語一致。如：Either the teacher or the students are our friends. / Neither they nor he is wholly right. / Is neither he nor they wholly right?
2、there be句型be動詞單復(fù)數(shù)取決于其后的主語。如果其后是由and連接的兩個(gè)主語，則應(yīng)與靠近的那個(gè)主語保持一致。如：There are two chairs and a desk in the room..
注意：Here引導(dǎo)的句子用法同上。
練習(xí)：主謂一致
1.I, who____ your friend, will try my best to help you with your English.
A.am B.is C.are D.be
2. The rich ____ not always happy.
A.are B.is C.has D.have
3. Neither Tom nor Jack and I ____ his students.
A.are B.am C.is D.was
4. Mary as well as her sisters ____ Chinese in China.
A. are studying B. have studied C. studies D. study
5. Neither my father nor I ____ at home.
A.am B.is C.are D.be
6. Not only my brother but also I ____ good at painting. Both of us ____ good painters.,
A.are;are B.am;am C.ani;are D.is;is
7. Every' boy and every girl ____ to attend the evening party.
A.wish B.wishes C.is like D.like
8. Over 80 percent of the population of China ____ peasants.
A.was B.is C. would be D.are
9. The population of China ____ larger than that of .any other country in the world.
A.is B.are C.has D.have
10. Every means ____ tried but without any result.
A. have been B.is to be C.are to be D. has been
11. Alice, together with two boys,____ for having broken the rule.
A. was punished B. punished C. were punished D. being punished
12. The League secretary and the monitor____ asked to attend the .meeting this afternoon.
A.is B.was C.are D.is being
13. The great writer and professor____.
A. is an old man B. are both old men
C. is an old man and a young man D. were two Chinese
14. There ____ a pen, two pencils and three books on the desk.
A.are B.is C.has D.have
15. A large number of students in our class____ girls.
A. are B. was C. is D. be
16. The number of deer, mountain lions and wild roses ____ much if people leave things as they are.
A. doesn' t change B.don't change C.change D.changed
17. The Arabian Nights ____ well known to the English.
A. is B. are C. was D. were
18. Chairman Mao' s works ____ published.
A. has been B.have been C.was D.is
19. A chemical works____ built there.
A. is to being B.have been C. were to D.has been
20. The Olympic Games ____ held every ____ years.
A.is;four B.are;four C.is;five D.are;five
21 .The United States of America one of the most developed countries in the world.
A.is B.are C.was D.were
22.He is the only one of die students who ____ elected.
A. are B.have C.has D.is
23.Theis is one of the most interesting questions that ____ asked.
A.have B.has C. have been D.has been
24.Many a man ____ come to help us.
A.have B.has C.is D.are
25."All____ present and all____ going on well," our monitor said.
A.is;is B.are;are C.are;is D.is;are
26. The police ____ the murderer everywhere when he suddenly appeared in a theatre.
A. is searching for B. were searching for
C. are searching for D. were searching
27.Your trousers____ dirty.You must have____ washed.
A.is;il B.are;it C.are;them D.is;them
28.This pair of trouseis ____ too long for him.
A.is B.be C.are D.were
29. One and a half bananas ____ left on the table.
A.is B.are C.has D.have
30. Eight times eight ____ sixty - four.
A.is B.are C.get D.equal
31 .Ten minutes____ an hour when one is waiting for a phone call.
A.seems B.seem C.seemed D.seemes
32.____of the money____ nm out.
A. Three-fifth; has B. Three-fifth; has been
C. Three-fifths; has D. Three-fifths; have
33. The whole class ____ the teacher attentively.
A. are listening to B. is listening to
C.are listening D. is listening
34.1 have finished a large part of the book, the rest of which___ more difficult.
A.is B.are C.was D.were
35. Between the two rows of trees ____ the teaching building.
A.stand B.stands C. standing D.are
36. Large quantities of water ____ for irrigation.
A. is needed B. has -needed C. are needed D. need
37. That they were wrong in these matters ____ now clear to us all.
A. is B.was C.are D.all
38.What we need____ good textbooks.
A.is B.are C.have D.has
39. What you said just now____ the matter we are discussing.
A.have something to at B. has something to do with
C.had something to do with D.has been something to do with
40. More than one member ____ against the plan.
A. is B.are C.has D.have
41. When and where to build the new factory ____ yet.
A. has not decided B. is not decided
C. are not decided D. have not decided
42. Half of the fruit ____ bad.
A. are B. has C. is D. have
43. ____ either of your parents come to see you recently?
A. Have B. Had C. Has D. Is
44. Mathematics ____ the language of science.
A. are B. are going to be C. is D. is to be
45. My family ____ small.
A. is B. were C. are D. makes
46. The following ____ some other examples.
A. are B. is C. was D. were
47. They both have some friends; but his ____ more active.
A. is B. will be C. was D. are
48. Both rice and wheat ____ grown in that country.
A. is B. are C. was D. has
49. Early to bed and early to rise ____ a good habit.
A. are B. is C. were D. was
50. To play basketball and to go swimming ____ useful for character-training.
A. was B. is C. are D. were
51. Either he or I ____ to attend the mass meeting this evening.
A. is B. am C. are D. be
52. ____ either he or I to attend the mass meeting this evening.
A. is B. am C. are D. be
53. An iron and steel works, with some satellite factories, ____ to be built here.
A. are B. were C. is D. will
54. She as well as her brother ____ a League member.
A. are B. were C. will D. is
55. His family ____ a big one. Now the family ____ watching TV.
A. is, are B. are, is C. is, is D. are, are
56. It is I who ____ going to attend the meeting tomorrow.
A. is B. am C. are D. be
57. More than 60% of the students ____ the countryside.
A. is B. are C. is from D. are from
58. Many a man ____ the novel.
A. has read B. have read C. is read D. are read
59. Tom is the only one of the students who ____ going to swim this afternoon.
A. is B. was C. are D. were
60. Here ____ a pen, a few pencils and some paper for you.
A. are B. is C. was D. were