Unit THREE 主谓一致 SAT 语法强化课 程一、主谓一致的基本原则 e.g.1 A book is on the desk. 主单谓单;主复谓复 e.g.2 Two books are on the desk.1 、主单谓单 单数可数名词 （主）单（谓） e.g.1 A book is on the desk. 不可数名词 （主）单（谓） e.g.2 Water is colorless. doing,to do,句子 （主）单（谓） e.g.3 Seeing is believing. To see is to believe. What you saw is true. 复合不定代词 （主）单（谓） e.g.4 Nobody knows his name.课堂练习1 ： The use of irrigation in the once-arid region have increased the production of alfalfa and of many other crops as well. （OG-P839-20） has increased 课堂练习2
