框架结构图
基数词的构成及作用
1.常用基数词表
Ⅰ
|
Ⅱ
|
Ⅲ
|
one
|
eleven
|
thirty
|
two
|
twelve
|
forty
|
three
|
thirteen
|
fifty
|
four
|
fourteen
|
sixty
|
five
|
fifteen
|
seventy
|
six
|
sixteen
|
eighty
|
seven
|
seventeen
|
ninety
|
eight
|
eighteen
|
hundred
|
nine
|
nineteen
|
thousand
|
ten
|
twenty
|
million/billion
|
2.基数词构成歌诀
1至12逐个记,13至19 teen结尾。
20至90整十位,ty结尾是后缀。
要是表示“几十几”,连字符十位连个位。
若要表示“几百几”,hundred之后and立。
若要用于复合形容词,连字符相连不加-s。
注意:(1)hundred,thousand,million,billion等词前有基数词或several时,须用单数;与of连用时,用复数,但其前面不能再加数词。如:
six hundred people hundreds of people
(2)dozen前有具体数词修饰时,用单数,of可省略;当dozen后面接these,those,them,us等词时,须先接of,再接这些词,但dozen仍不加-s;dozens of中的of不可省。score用法和dozen相当,但of一般不省略。
several dozen pencils dozens of students
three dozen of these eggs two dozen of them
two score of eggs scores of books