nobody doing 谓单数
both and 连接谓复数
C替换A+B莫单数
介、分插名词就远走
选择性therebe就近守
倒装结构就后搂一搂
这些原则说顺口
主谓一致你最牛
一句一句解释咯：
nobody doing 谓单数——也就是主单谓单原则
①单数可数名词(主)à单(谓)
e.g.1 A book is on the desk.
②不可数名词 (主)à单(谓)
e.g.2 Water is colorless.
③doing (主)à单(谓)
e.g.3 Seeing is believing.
④不定代词 (主)à单(谓)
e.g.4 Nobody knows his name.
both and 连接谓复数——也就是主复谓复原则
①可数名词复数(主)à复(谓)
e.g.1 Two books are on the desk.
②A and B (主)à复(谓)
e.g.2 Pears and apples are fruits.
③both A and B (主)à复(谓)
e.g.3 Both Lucy and Lily are girls.
C替换A+B莫单数——也就是名词数的一致性
The convenience and widespread
availability of watercolor paint
are (a reason/reasons) for its popularity with amateur artists.
n1+n2 不是 a/an + n(单)
介、分插名词就远走——就远原则的两种情况
N1+修饰成分+N2+谓动
修辞成分是介词和分词
选择性therebe就近守——就近原则的两种情况
①not only N1 but also N2+谓动
not N1 but N2 +谓动
neither N1 nor N2+谓动
either N1 or N2+谓动
②There be +N1
There be +N1 and N2
倒装结构就后搂一搂——就后原则
比如only，形容词，介词，done放开头的是SAT最常考的
