数词的用法
数词分基数词和序数词。基数词表示数目，序数词表示顺序。
1. 基数词的用法
(1) 基数词在句中主要用作主语、宾语、定语、表语、同位语，例如：
Thirty of them are Party members.(主语)
--- How many would you like?
--- Three ，please.(作宾语)
The nine boys are from Tianjing.(定语)
Six plus four is ten.(表语)
We four will go with you.(同位语)
(2) 表示一个具体数字时，hundred， thousand， million一律不用复数;在表示一个不确定数字时则用复数。例如：
Our country has a population of 1，300 million people.
There are three thousand students in our school.
After the war， thousands of people became homeless.
Maize is the most important food crop for millions of people in the world.
They arrived in twos and threes.
(3) 表示“……十”的数词的复数形式可用来表示人的岁数或年代，例如：
He is in his early thirties.
He died still in his forties.
This took place in 1930s.
(4) 表示时刻用基数词。例如：
We get up at six.
The workers begin work at eight.
表示“几点过几分”，用介词past，但须在半小时以内。例如：
ten past ten，
a quarter past nine，
half past twelve
表示“几点差几分”用介词to， 但分数须在半小时以上。例如：
twenty to nine，
five to eight，
a quarter to ten
表示“几点几分”还可直接用基数词。例如：
seven fifteen，
eleven thirty，
nine twenty
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