hxw

a portion of
a series of
a species of
谓语用单数
A series of panel discussion is scheduled for the convention.

  (the) part of
后面常用单数谓语，偶尔也用复数

The most interesting part of the investigations was the discovery and identification of the forged letters.

form of
type of
kind of
由form, type, 与kind的单复数而定

The kind of books an author writes depends on the kind of man who he is.  

Some new types of bus are now on show.

There are three kinds of computer.

an amount of  + u.n. 谓语只有单数
quantity of  + c.n. 谓语只用单数
quantities of + c. or u.n. 谓语用复数

The total amount of money is 100 dollars.
There is a large quantity of milk.
Large quantities of water are needed for cooling purposes.

plenty of
half of
看of后的名词

There is plenty of water in the pail.
There are plenty of books on the table.

Half of this building is to be completed by autumn.
Half of the buildings on our campus are of redbrick construction.

the majority of 只跟复数名词，只用复数谓语
the majority

The majority of boys like football.

a number of  跟复数名词，用复数谓语
the number of 跟复数名词，用单数谓语

At present a large number of people think the worst danger from automobiles is
accidents and not pollution.

The number of students that you have met is the life of the team.