1.可数: many,a number of,several,both,a couple of,few (fewer--fewest).
2.不可数: much,a greatdeal of,an amount of,a sum of,little(less--least),quantity of
3.都可: a lotof,lots of,plenty of,some,most,all.
4.mostof,all of,some of,many of,much of “不定代词短语”修饰名词时,名词前必须要有" the "(表名词为特指).
Most of the books are interesting.
Most books ... ...
5.上述结构中, 句中“主语的数”取决于介词 of 后面“名词的数”
1.复数原则:表示“复数概念”的就用复数形式.
2.单数原则:表示“单数或抽象”的概念，就用单数形式.
3.特殊情况:
1)就“近”原则:有 ... or ... 形式的( ... or ...; either... or...; neither...or...; not only... but also... )
There be … 句型
Not only the students but also their teacher is invited to attend the party.
2)就“前”原则:...,as well as ... + V. (补充说明成分:with,along with,rather than)
My mother, as well as my two brothers has a key to the office.
3)a number of / a total of / an average of + 复数名词 + 动-复;(a 表示“大量”)
the number of / the total of / the average of + 复数名词 + 动-单;(the 表示“什么东西的数量”, 是个抽象概念 )
4)the adj./ v-ed 表示“一类人”时，动-复，表示“抽象概念”时，动-单
5)every, each 后面的名词为单数
Each book and magazine is listed in the card catalog.
each of, one of 后面的名词为复数
Each of the students has a schedule.
many a 后面的名词为单数
Many a college student wishes to return to the easy days of high school.
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