e.g. Six monthes is too short a time.
There were six silver dollars in each of the stockings.
两数相减和相除用单数，相加和相乘用复数
视of-词组中名词类别而定的情况
分数/百分数+of-词组
all of.../some of.../half of.../most of...
lots of/heaps of/loads of/scads of/plenty of+n.
其他情况
one in/one out of+n.复数
正式语体 单数
非正式语体 复数
a+ portion/series/pile/panel/committee+of 通常用单数
限定词+kinds/type/sorrt +of 单复数取决于限定词单复数形式
an average of/a majority of+n.复数 单复数遵循意义原则
many a/more than one 用单数
分句作主语的主谓一致问题
以名词性分句作主语 遵循意义原则
以非限定分句作主语 遵循意义原则
关系分句中的主谓一致问题
one of +复数名词+关系分句 通常遵循语法一致原则用复数形式
强调one或此类结构有the/the only等限定词和强调词时时也可遵循意义原则用单数
分裂句（强调句）中的主谓一致问题
that-/who-分句的动词形式通常依先行项而定
正式语体 依先行项
非正式语体 用第三人称单数
存在句中（There be 句型）的主谓一致问题
非并列结构取决于随后的实意主语
并列结构采取就近原则
例句
非并列结构：There are three routes you can choose.
There is a note left on the desk.
并列结构：There is a long springboard and three rafts.
例句
正式语体：It is I who am to blame.
非正式语体:It is me that is(第三人称单数) to blame.
例句
Two-thirds of the city was destroyed in the war.
Thirty-five percent of the doctors were women.
Most of the money was recovered by Tom.
Most of the members were there.
Lots of food is going to waste.
Lots of people are waiting outside.
例句
His brother rather than his parents is to blame.
The father, as well as his sons, is going to enroll.
No one except twomgirls was late for dinner.
红体为主语中心词，谓语动词（蓝体）遵循语法原则其单复数形式与主语中心词的单复数形式保持一致。
