(A)
1. a与an的区别 (发音而非字母)
an: herd undergraduate understanding oyster honest
a : unique university unite yawn
2. a与复数名词的混用
an outstanding methods.
3. 不定冠词a的遗漏
(1)固定短语中a的遗漏
a set of, a piece of, a variety of, a series of,
a collection of , a wide range of
a wealth of + 不可数名词(information)
(2)强调可数名词的单数概念
且无其它限定词,必须用不定冠词
也就是说,单数可数名词前必须有限定词
* v+单数可数名词 错
prep+单数可数名词 错
of humid area area可数,所以错
of prize fighter fighter可数,所以错
of raindrop 亦然
例外:a. a part of= part of
part 永远对
b. 表示职务、身份、亲属关系的词可以单独使用
Little Bush, son of George Bush, is running
for the office of president.
c. 表示“种类”名词后所接noun可单独使用
type of , kind of, sort of
d. 表示某一方面的名词可单独使用
All cells differ in function, in size, in color, in shape.