单位词的使用
(1)不可数名词表示多少，一般用much,(a)little,a lot of,enough 等词表达，要数1，2，3，4…时要用"量词"表达，最常用的是a piece of(news,advice,furniture,information…)。
(2)成双成对的名词一般用复数，如：a pair of trousers(裤子)/ scissors(剪刀)/ glasses(spectacles)(眼镜)/ pliers(钳子)
(3)a couple of表示一对，或2-3…，如：a couple of days / people / things
(4)记住以下量词表达方式：
a loaf(two loafs)of bread(一个(两个)面包)
a burst of laughter(一阵笑声)
a fit of anger / chill(一阵发怒 / 发冷)
a game of chess(一盘棋)
a lump of sugar(一块方糖)
10、其他应注意的数的表达形式
1)a three-year-old boy 比较The boy is three years old
2)five thousand people / several thousand people比较 thousands of people
表达具体数字时，thousand不加 "s"，后面不加 "of "; ten,million,billion情况以此类推。
3)One-third of the students have passed College English Test Band IV.
Two-thirds of the students have passed College English Test Band IV.
One-third of the population in this area is living below the poverty line.
(这个地区有1/3人口生活在贫困线以下。)
注意：几分之几的表达形式;动词的单复数由后面的名词数决定。
4)a looker-on 比较two lookers-on(旁观者)/ a brother-in-law比较two brothers-in-law(姻亲兄弟)
5)my father,together with(along with / with / as well as my mother and brothers)结构中，主语作单数处理，即my father.