I often help him and he often helps me. We often help each other.
二、意义一致
主语形式虽为单数，但意义为复数，则 谓语动词用复数； 主语形式为复数，而意义为单数，则谓 语动词用单数。

The crowd were surrounding the government official. Maths is hard to learn.
二、复数形式的名词与谓语动词的一 致
复形名词（大多以s结尾）在句中作主语通常 要求谓语复数动词，具体应用要注意如下几点：
1. 含双数概念的复形名词要求复数动词 Are your kitchen scales(天平) accurate? 2. 含复数概念的复形名词要求复数动词 The customs (关税)were paid. My funds (资金)are a bit low at present. 3. 含单数概念的复形名词要求用单数动词 His works (工厂)is rather small. 4. 表时间，距离，钱额的复数名词用单数动词 Ten years is a moment in history. Ten thousand dollars is a large sum. 5. 外来的复形名词要求用单数动词 This data is very interesting.
2. “each / every / no+单形名词+ each / every / no+单 形名词”结构要求单数动词 Every hour and every minute(每一小时，每一分钟) is important. 3. “名词/代词+or+名词/代词”结构应根据or后的名 词/代词确定单/复数动词 He or I (他或是我) am in the wrong. He or his brothers(他或他的兄弟们) were to blame. 4. “either+名词+or+名词”结构应根据or后的名词/代 词确定单/复数动词 Either the shirts or the sweater(这些衬衣，要不就 是这件毛衣) is a good buy.
6. 以-ics结尾表学科的复形名词要求用单数动词 Politics(政治) is often a topic for discussion. Statistics (统计学) is a principal course at the business school. 注意： 这类名词用于表示具体的、实际的内容时，则往 往要求复数动词。 What are your politics(政治观点)? Statistics(统计数字) prove nothing in this case.
6. “an average / total of +复形名词”结构应用复 数动词；而“the average / total of +复形名词” 结构应用单数动词。 An average of 3000 letters (平均3000封信) a month are received by the newspaper’s office. A total of 3000 letters(总共3000封信) were received last month. The average of letters(信件的平均数) received each month is 3000. The total of letters(信件的总数) received last month was 3000.
三、并列主语与动词的一致
并列主语是指主语为and、or等并列词 连接的名词作主语，其谓语的单复数要看 情况而定，具体用法如下：
1.
当“名词+and+名词”结构表示一种事物或 一种概念时，应用单数动词 Fish and chips(炸鱼土豆片) is a popular supper. The poet and writer(诗人兼作家) has come. 注意：有时并列主语用单数或复数动词都可 Time and tide(岁月) wait / waits for no man.
5. “not only+名词+but (also) +名词”结构要求动词应 与but (also)后的名词一致 Not only the students but also their teacher(不仅是 学生，他们的老师也) is enjoying the film. 6. “neither+名词+nor+名词”结构要求动词与nor后面 的名词一致 Neither you nor your brother(你和人你的兄弟都不) is in fault. Neither he nor they(你和他们都不) are mistaken. 7. “there be”结构的动词应与最靠近它的名词的单复 数一致。 There is a desk and some chairs in the room. There are some chairs and a desk in the room.
一、单数形式的名词与谓语动词 的一致之单形集体名词
1.单形集体名词被视为一个整体时，用作单数 名词 Our family has a reunion every year. 2. 单形集体名词被视为若干个体时，则要求复 数动词 His family are waiting for him. 3. 有些单形集体名词，即所谓的“群体名词”， 如police，cattle等，要求复数动词 The police have caught the murderer.
高中英语中主谓一致的用法
主谓一致的定义
主谓一致是指谓语在人称和数上必须和主 语的人称和数保持一致。这是英语语法中 必须遵循的基本规则，也是英语和汉语区 别很大的地方。
主谓一致的三大原则
一、语法一致原则 二、意义一致原则 三、就近原则
一、语法一致原则
主语为单数或不可数形式，则谓语动词 也用单数形式； 主语为复数形式，则谓语动词也用复数 形式。
7. “a lot / mass / heap/plenty…of +名词”结构要求谓 语动词与of后的名词的单复数一致。 A mass of people(许多人) were seen working there. A lot of money(很多钱) is spent on travel. 8. “a large quantity of +不可数名词或复数名词”、“a large amount of +不可数名词”结构要求单数谓语 动词；“large quantities of +不可数名词或复数名 词”、“large amounts of +不可数名词”结构要求 复数动词。 A large quantity of students(很多学生) is coming. Large amounts of water(大量水) are wasted.
五、“表部分的名词+of+名词”结构与 动词的一致 1. “one of + 复形名词”结构后的定语从句要求
谓语动词应用复数；但当“one of”前有限 定词如the、the only、the very等修饰时， 结构后的定语从句要求谓语动词应用与one 一致，用单数谓语。 This is one of the best books that have appeared. She is the one of those women who doesn’t know a thing about furniture.
7. 以-s结尾的某些表疾病的复形名词要求用单 数动词 German measles(风疹) is a dangerous disease for pregnant women. 8. 有些复形名词既可用单数动词也可用复数动 词 Where is / are your manners(礼貌)? 9. 复形书名一般要求用单数动词 The Newcomers《新来的人们》 is one of Thackeray’s finest books.
单数形式的名词与谓语动词的一 致之 “两个形容词+一个单形名 词” 在“两个形容词+一个单形名词”结构中，
单数名词如有复念（即代表两个事物）， 则用复数动词 The red and the white rose are both beautiful. English and French grammar are not very difficult to learn.
4. “a group(一组) / crowd(人群) / flock(一群) / file(一列)… of +复形名词”结构可用单数动 词，也可用复数动词。前者强调整体，后者 强调各个组成部分。 This group of students(这一组学生) is to be sent to Italy. This group of students(这组学生都) are to be sent to Italy.
2. “a pair of +复形名词” 结构多要求用单数谓语， 但“复数名词+of a/this/that pair”结构多用复数谓 语。 A pair of gloves(一双手套) is a nice present. Socks of this pair(这双袜子) are different in size. 3. “(a) part of+ 名词”结构中，若名词为单形，一般 要求用单数动词，若名词为复形，则复数动词。 (A) part of the story(故事的一部分) is not true. A part of the apples(部分苹果) are bad