更新时间:作者:小小条
主谓一致是英语语法的"平衡杆",核心在于谓语动词的形式需与主语在人称、数上保持一致。看似简单,实则暗藏诸多"陷阱",尤其是当主语结构复杂(如并列主语、不定代词、从句作主语等)时,极易出错。以下从体系、学*要点和高频考点三方面拆解,帮你精准把握。

一、主谓一致核心体系:3大原则定方向
1. 语法一致原则:谓语动词形式完全随主语的语法形式(单复数)变化。
例:He is a teacher.(单数主语→单数谓语)
They are doctors.(复数主语→复数谓语)
2. 意义一致原则:谓语动词形式随主语所表达的"实际意义"(单复数)变化,而非表面形式。
例:The team are discussing their plans.(team指队员们,表复数意义→复数谓语)
The news is shocking.(news为不可数名词,表单数意义→单数谓语)
3. 就近原则:当主语由"or""either...or""neither...nor"等连接时,谓语动词形式随"最近的主语"变化。
例:Either the teacher or the students are responsible.(最近主语students为复数→复数谓语)
Neither you nor he is wrong.(最近主语he为单数→单数谓语)
二、学*要点:8大易错场景与破解方法
1. 单数主语的"伪装"——形式复数,意义单数
- 学科类名词(maths, physics)、疾病类名词(measles, diabetes)、游戏类名词(darts, cards)虽以-s结尾,实则表单数,谓语用单数。
例:Physics is my favorite subject.
- "the+形容词"表一类人时(如the poor, the old),表复数意义,谓语用复数;表抽象概念时(如the beautiful),表单数意义,谓语用单数。
例:The old are well taken care of here.(表一类人→复数)
The beautiful is worth pursuing.(表抽象概念→单数)
2. 复数主语的"陷阱"——形式单数,意义复数
- 集合名词(family, team, class等)指"整体"时表单数,指"成员"时表复数。
例:Our family is moving to Beijing.(整体→单数)
Our family are all music lovers.(成员→复数)
- "a number of+复数名词"表"许多",谓语用复数;"the number of+复数名词"表"数量",谓语用单数。
例:A number of students are absent.
The number of students is 50.
3. 并列主语的"分歧"
- "and"连接两个单数主语时,通常谓语用复数;但两词表同一人/物/概念时(如a teacher and writer),谓语用单数。
例:A doctor and a nurse are coming.(两人→复数)
The doctor and writer is coming.(同一人→单数)
- "with/along with/together with"连接主语时,谓语只随"前面的主语"变化(就远原则)。
例:He along with his friends is going to the party.(主语为he,单数→单数谓语)
4. 不定代词作主语——"单复分明"
- 表单数:each, every, either, neither, someone, everybody, nothing等。
例:Everyone has a dream.
- 表复数:both, few, many, several等。
例:Few know the truth.
- 视语境定单复:all, some, any, none等。
例:All is ready.(表整体→单数)
All are here.(表个体→复数)
5. 数词、量词作主语——"意义优先"
- "分数/百分数+of+名词"作主语,谓语随"of后的名词"变化。
例:Two thirds of the water is polluted.(water不可数→单数)
40% of the students are from the south.(students可数复数→复数)
- "one of+复数名词"表单数,谓语用单数;"the only one of+复数名词"也表单数(强调"唯一")。
例:One of the boys is missing.
She is the only one of the girls who has passed the exam.
6. 从句作主语——"单复数看内涵"
- 名词性从句(主语从句)作主语,通常表单数,谓语用单数;若表复数意义(如并列从句),谓语用复数。
例:What he said is true.(单一从句→单数)
What he said and what he did are quite different.(并列从句→复数)
7. 时间、距离、金钱作主语——"整体视为单"
- 表时间、距离、重量、金钱等的复数名词作主语,通常视为整体,谓语用单数。
例:Ten years is a long time.
Five thousand dollars is enough.
8. 祈使句、倒装句中的一致——"还原主语定单复"
- 祈使句主语为you(省略),谓语用原形。
例:Be quiet!
- 倒装句需还原主语定单复。
例:On the wall hang two maps.(主语maps为复数→复数谓语)
三、高频考点10例(附解析)
1. The United States ______ (be) a developed country.
答案:is
解析:国名表单数,遵循语法一致原则。
2. Neither my parents nor I ______ (agree) with you.
答案:agree
解析:neither...nor...遵循就近原则,最近主语为I(第一人称)→ 原形agree。
3. Three hours ______ (be) enough for the task.
答案:is
解析:时间名词作主语视为整体,表单数。
4. The class ______ (be) divided into four groups. Now the class ______ (be) having a discussion.
答案:is;are
解析:第一空class指整体→单数;第二空指成员→复数。
5. A number of books ______ (be) donated to the school. The number of them ______ (be) 2000.
答案:are;is
解析:a number of表"许多"→复数;the number of表"数量"→单数。
6. What he needs ______ (be) more practice. What he needs and what he wants ______ (be) different.
答案:is;are
解析:单一主语从句→单数;并列从句表复数意义→复数。
7. Each student and each teacher ______ (have) a new book.
答案:has
解析:each...and each...连接主语,视为单数,谓语用单数。
8. The old ______ (be) respected in our country.
答案:are
解析:the old表"老年人",复数意义→复数谓语。
9. Bread and butter ______ (be) his daily breakfast.
答案:is
解析:bread and butter表"涂黄油的面包",视为单一食物→单数。
10. Not only the students but also their teacher ______ (be) interested in this activity.
答案:is
解析:not only...but also...遵循就近原则,最近主语teacher为单数→单数谓语。
主谓一致的核心是"形式服务于意义",既要盯住主语的表面形式,更要吃透其内在含义。记住"语法一致是基础,意义一致是关键,特殊规则靠积累",就能避开大部分陷阱,让句子"平衡"得恰到好处。
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