正确的英语句子一方面要句子成分完整，也就是要具备主语和谓语，另一方面就是主语和谓语必须单复数一致，即主谓一致，指得是句子的谓语动词与其主语在数上必须保持一致，句子的主语是单数，其谓语动词需要用第三人称单数形式；主语是复数形式，则谓语动词用复数形式。
主谓一致主要遵循三个原则：
①语法一致原则：主语是单数形式时，谓语动词也采用单数形式；主语是复数形式时，谓语动词也采用复数形式。
②意义一致原则：谓语动词的形式根据主语所表达的单复数概念而定。
③领近一致原则：谓语动词的形式根据靠近谓语动词的主语而定。
01语法一致原则
【主单谓单】
（1）不定代词 either, neither, the other, another, anybody, anyone, anything, someone, somebody, something, everyone, everybody, everything, nobody, no one, nothing等作主语时，谓语动词用单数。
eg. Everyone is ready for the meeting.
大家都为会议做好了准备。
（2）由each,each...and each...,every...and every...作主语时，谓语动词用单数形式。
eg. Each boy and each girl was given a new book.
给了每一个男孩和每一个女孩一本新书。
（3）不定式或动名词作主语时，谓语动词一般用单数形式。
eg.Reading is learning.
读书就是学习。
（4）“the number of+名词复数”作主语时，谓语动词用单数形式。
eg. The number of the students in our class is 30.
我们班学生人数为30。
（5）a lot of/ lots of/ plenty of/ a pile of/ most of/ +不可数名词，作主语，谓语动词用单数形式。
eg.A lot of work is to be done to prepare for the conference.
为了准备会议，还有很多工作要做。
（6）a great/good deal of, a little, quite a little, a large amount of+不可数名词，作主语，谓语动词只用单数形式。
eg. A great deal of time was wasted playing but ought to have been fully used.
很多时间在玩耍中浪费掉了，本应充分利用的。
（7）more than one+ 可数名词单数，作主语，谓语动词用单数形式。
eg. More than one person was injured in the accident.
不止一人在这次事故中受伤了。
（8）many a +可数名词单数，作主语，尽管意义上是复数，但中心词是单数形式，谓语动词也需要单数。
eg. Many a young man has tried and failed.
许多年轻人都试过，而且都失败了。
【主复谓复】
（1）当and或both...and...连接名词作主语时，谓语动词用复数形式。
eg.Both Lucy and Lily are students.
露西和莉莉都是学生。
（2）一些复数形式的名词（clothes, trousers, shorts, pants, shoes, gloves...）作主语时，谓语动词用复数形式。
eg. My shoes were worn out.
我的鞋子穿得不能再穿了。
小贴士
这些由两个对应部分组成的可数名词复数，如trousers、pants、glasses、scissors（剪刀）等作主语，前面若无a pair of、a suit of 、a set of、a serious of等这类单位词，谓语动词用复数；若带有单位词，则根据单位词的单复数决定谓语动词的单复数形式。
eg. The two pairs of scissors are made in Hangzhou.
这两把剪刀都是杭州制造的。
（3）“a number of+名词复数”作主语时，谓语动词用复数形式。
eg. A number of trees are cut down.
一些树木被砍倒了。
（4）a lot of/ lots of/ plenty of/ a pile of/ most of/ +可数名词复数，作主语，谓语动词用复数形式。
eg.Lots of people have been there.
很多人去过那儿。
（5）more +可数名词复数+than one,作主语，谓语动词要用复数形式。
eg. More members than one are against the proposal.
反对这项提议的会员不止一个。
（6）several, a few, quite a few, a great/good many 作主语或者修饰可数名词复数时，谓语动词用复数形式。
eg.Usually few regard their work as a pleasure.
通常很少有人把工作当做一种乐趣。
（7）a group of/ a couple of +可数名词复数，作主语，谓语动词用复数形式。
eg.A couple of days have passed since we parted.
我们分手已经好几天了。
（8）分数/百分数+of+名词，作主语，谓语根据名词的单复数来决定。
eg.Nearly 20% of the students were absent that day.
那天将近20%的学生缺席。
eg.Two thirds of the money is mine.
这些钱中有2/3是我的。
（9）主语后接with, along with,together with, as well as, rather than, including, besides, like,except,but等词或短语时，谓语动词由主语的单复数决定。
eg.Mr. Green, together with his children,has come to China.
格林先生和他的孩子们一起来到了中国。
eg.The students as well as their teacher are playing a game on the palyground.
学生们正和他们的老师一起在操场上做游戏。
（10）the other +基数词+（可数名词复数）、another+基数词+（可数名词复数）作主语，谓语动词用复数。
eg.Five people came to help,but another three were still needed.
已经有五个人来帮忙了，但还需要三个。
语法一致的情况很多，先消化消化，明天我们继续聊另外两个原则，意义一致原则和邻近原则，不见不散哦~
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