1.单复数同形的名词作主语的主谓一致：
(1)单复数同形的名词作主语，要根据上下文的意义及修饰这些词的词来确定其谓语形式；
(2)这些词包括：sheep（绵羊）, deer（小鹿）, fish（鱼，鱼肉）, series（系列）, means（方式）, works（作品）, aircraft（飞行器）, species（种类）等。
e.g. There are various species of butterflies.
There has been a series of accidents at the crossing.
Every means has been tried.
A sheep doesn’t belong to ours.
There are many sheep on the hill.
2. 集合名词作主语的主谓一致：
(1)集合名词作主语，如果表示整体概念，谓语动词用单数；如果表示成员则用复数：
(2)常见的集合名词：class, couple, family, group, team, public等.
e.g. If the football team wins the game, the club will be the champion.
The football team are discussing the problem with their coach now.
The family has lived in the house for over 20 years.
The family are going abroad for a holiday.
(3)注意：有些集合名词，如：folk, people, police, cattle,等作主语，动词总跟复数形式。
e.g. Cattle are grazing in the field.
The police carry the weapons.
3.复数名词形式作主语的主谓一致：
(1)以s结尾的书刊名，国名，组织名等作主语时，谓语动词通常用单数形式；
e.g. The United States is composed of fifty states.
The Canterbury Tales《坎特伯雷故事集》was written by Chaucer.
(2)表示群岛，瀑布，山脉等词以s结尾的专有名词作主语时，谓语动词往往用复数形式；
e.g. The Alps(阿尔卑斯三脉) are in Europe.
The Philippines are in the Pacific Ocean.
(3)以ics结尾的名词指一门学科时，作主语常用单数谓语动词形式，但当这些名词表示实际内容时，谓语动词则用复数形式；
这些词有 mathematics（数学）, statistics(统计学), acoustics(音响学)， electronics(电子学), linguistics(语言学), physics, economics。
e.g. Physics are the only course he failed in.
Statistics is a subject that is difficult to learn.
Economics is her major.
Economics have greatly improved in the country.
Statistics show that the number of housewives who find part-time jobs has increased recently.
