9、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。)