可数名词的复数：词尾直接加s 例如：book books
将y变i后加 es 例如: city cities
在后ss,sh,ch,x 或o后边加es 例如:classes,dishes,watches,taxes
volcanoes, 特殊photos,radios,pianos,solos
在f或fe后边 例如:life lives, wife wives, leaf leaves,
元音变化 例如: man men, foot feet , mouse mice
词尾元音变化 例如: analysis analyses,
特殊变化 例如: medium media, child children,
单复同形 例如: deer , sheep, aircraft
形为复数，实为单数 例如: the United States ,the Philippines
news, series,physics,ethics,
只有复数形式 例如: pincers , scissors, trousers , compasses
2． 代词：除了引出定语从句的关系代词外，比较重要的是一些不定代词，例如 all, every, each, both, one, none, many, some, any, no, 以及either…or，neither…nor 搭配 ; few, a few , little , a little 的区别；other, another, the other, others , 的区别；
other 指另外的人或物；others 泛指别人，可与some 连用；the other 指两个中的另一个，常和one 连用；the others 表示其余所有的人或物；another 则泛指另一个。
例如：
Some pupils are reading the text loudly, while other students are doing their homework.
Some pupils are reading the text loudly, while others are doing their homework.
MS. Green has two beautiful hats. One is red, the other is blue.
This suit doesn’t fit me. Would you please show me another one?
还有代词it的用法，它既可以代替具体事物，又可以代替抽象事物，还可表示天气，时间距离等。此外，it还可以作先行词，作形式主语，形式宾语或者引出强调句型。
例如：
Coffee delays the body clock in the morning, and advances ____ at night.
A. it B. them C the coffee D. the clock
此题中，it 是指代 the body clock 的代词
_________whether robots will one day have vision as good as human vision.
A. What is not yet known B. It is not yet known
C. As is not yet known D. This is not yet known
此题中，it 是作形式主语
3． 数词：序数词、分数的表达，
序数词：the first, the second, the third , the forth. …..
分数：三分之二 ， two thirds ; 四分之三，three fourths ; (three quarters)
one hundred ; two hundred (正)， two hundreds (误) ； hundreds of (正) ， two hundreds of （误）；one / two hundred hours, (正) hundreds of hours,(正)
|
