育才助教中心内部资料
There are three thousand students in our school. After the war, thousands of people became homeless. 3）在一些表示\一排\或\一组\的词组里；
如：They arrived in twos and threes. 他们三三两两的到达了。 4）表示\几十岁\， 例如：He died still in his forties． 5）表示\年代\，用 in +the +数词复数； 二、序数词
1）序数词主要用作定语，前面要加定冠词，例如： The first truck is carrying a foot baskets．
2）序数词有时前面可加不定冠词来表示―再一‖，―又一‖这样的意思，例如： We'll have to do it a second time．
3) 注意较为容易拼写错误的序数词及其缩写形式：one---first, two---second, three---third, five---fifth, eight---eighth, nine---ninth, twelve---twelfth。 缩写形式：first→1st twenty-second→22nd
4) 表示分数时，分子用基数词表示，分母用序数词表示。分子大于1时，分母加-s。例如： three fourths, one second, two fifths 2、难点 倍数表示法
主语+谓语+倍数（或分数）+ as + adj. + as
I have three times as many as you. 我有你三倍那么多。 3、易错点
1. We will have a _________ holiday after the exam.
A. two month B. two-month C. two month‘s D. two-months
答案: B (选择C的同学要注意应用two months‘; 选择D的同学要注意名词之间有 ―— ― 后的组合词当作形容词来用, 因此就不用所有格形式了.) 2. ._______ trees are cut down in the forests every year.
A. Thousand B. Thousands C. Thousand of D. Thousands of 答案: D. (选择C的同学注意词组记忆的准确性) 3. Our sports meeting will be held ________.
A. on 24, Tuesday, April B. in April 24, Tuesday C. on Tuesday, April 24 D. in April Tuesday 24
答案: C. (选B的同学是受到中文的影响,要特别注意中英文的差异) May 20th,2002,the twentieth of May,2002
注意：带有数词的名词作定语时，一般用单数形式 a seven-year-old boy
second→2nd
third→3rd fourth→4th
育才助教中心内部资料
4. Our school will hold a sports meeting next week. Tom and I will be in boys' . A.800-metres-race B.800-metres race C.800-metre race D.800 metre race
答案: C. 800来修饰race,有两种表达法，800-metre race或800 metres' race. 5. I'm very hungry