(四)數(shù)詞
1. 數(shù)詞分類：
分類
在句中充當(dāng)?shù)某煞?BR> 例詞
基數(shù)詞
主語、表語、賓語、定語、同位語
one, eleven, fifty
序數(shù)詞
主語、表語、賓語、定語、同位語、狀語
second, eighth, fortieth
2．基數(shù)詞的構(gòu)成及用法：
類型
構(gòu)成方法
例詞
1-12
單獨的詞
one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve
13-19
在3-9的詞尾加上“-teen”
thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen
20,30,40-90
以“-ty”結(jié)尾
twenty, thirty, forty, fifty, sixty, seventy, eighty, ninety
100,1000,1000,000,
1000 000 000,
百，千，百萬，十億都有具體量詞
one/a hundred, one/a thousand,
one/a million, one/a billion
21-99
“幾十”和“個位”之間用連字符“-”
twenty-three,forty-eight
101-999
“百位”后“十位”前加“and”
826: eight hundred and twenty-six
1,000以上
先從右向左每三位數(shù)加一逗號，從右向左第一個逗號為thousand,第二個為million,第三個為billion,然后每三位為一單位從左向右讀。
1，234，567，892: one billion, two hundred thirty-four million, five hundred sixty-seven thousand eight hund red and ninety-two
3.序數(shù)詞的構(gòu)成：
類 型
構(gòu)成特點
例詞及縮寫式
one, two, three
單獨記憶
first (1st), second (2nd), third (3rd)
four～nineteen
在基數(shù)詞尾加-th
fifth (5th), ninth (9th), twelfth (12th)
-ty結(jié)尾的詞
把y→ie，在基數(shù)詞尾加-th
twentieth (20th), fiftieth (50th), fortieth (40th)
以1～9結(jié)尾的多位數(shù)
變個位數(shù)為序數(shù)詞即可
twenty-first (21st), ninety-ninth (99th)
hundred, thousand, million, billion
在基數(shù)詞尾加-th即可
hundredth (100th) thousandth (1,000th) millionth
(1,000,000th) billionth (1,000,000,000th)
4.序數(shù)詞的用法：
序號
用法特點
舉 例
1
前面要加the
He’s always the first to get to meeting-room.
2
前面用a/an表“又一，再一”
He’d better try a fourth time.
1. 數(shù)詞分類：
分類
在句中充當(dāng)?shù)某煞?BR> 例詞
基數(shù)詞
主語、表語、賓語、定語、同位語
one, eleven, fifty
序數(shù)詞
主語、表語、賓語、定語、同位語、狀語
second, eighth, fortieth
2．基數(shù)詞的構(gòu)成及用法：
類型
構(gòu)成方法
例詞
1-12
單獨的詞
one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve
13-19
在3-9的詞尾加上“-teen”
thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen
20,30,40-90
以“-ty”結(jié)尾
twenty, thirty, forty, fifty, sixty, seventy, eighty, ninety
100,1000,1000,000,
1000 000 000,
百，千，百萬，十億都有具體量詞
one/a hundred, one/a thousand,
one/a million, one/a billion
21-99
“幾十”和“個位”之間用連字符“-”
twenty-three,forty-eight
101-999
“百位”后“十位”前加“and”
826: eight hundred and twenty-six
1,000以上
先從右向左每三位數(shù)加一逗號，從右向左第一個逗號為thousand,第二個為million,第三個為billion,然后每三位為一單位從左向右讀。
1，234，567，892: one billion, two hundred thirty-four million, five hundred sixty-seven thousand eight hund red and ninety-two
3.序數(shù)詞的構(gòu)成：
類 型
構(gòu)成特點
例詞及縮寫式
one, two, three
單獨記憶
first (1st), second (2nd), third (3rd)
four～nineteen
在基數(shù)詞尾加-th
fifth (5th), ninth (9th), twelfth (12th)
-ty結(jié)尾的詞
把y→ie，在基數(shù)詞尾加-th
twentieth (20th), fiftieth (50th), fortieth (40th)
以1～9結(jié)尾的多位數(shù)
變個位數(shù)為序數(shù)詞即可
twenty-first (21st), ninety-ninth (99th)
hundred, thousand, million, billion
在基數(shù)詞尾加-th即可
hundredth (100th) thousandth (1,000th) millionth
(1,000,000th) billionth (1,000,000,000th)
4.序數(shù)詞的用法：
序號
用法特點
舉 例
1
前面要加the
He’s always the first to get to meeting-room.
2
前面用a/an表“又一，再一”
He’d better try a fourth time.