英語的序數詞基本變法：
(1) 一般在基數詞后加th,(2)-ve結尾的改為-fth,(3)-ty結尾的改為-tieth,(4)熟記特殊詞。
2、序數詞如下：
|
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th
|
※first
※second
※third
fourth
fifth
sixth
seventh
eighth
ninth
tenth
eleventh
twelfth
|
13th
14th
15th
16th
17th
18th
19th
|
thirteenth
fourteenth
fifteenth
sixteenth
seventeenth
eighteenth
nineteenth
|
20th
30th
40th
50th
60th
70th
80th
90th
100th
|
twentieth
thirtieth
fortieth
fiftieth
sixtieth
seventieth
eightieth
ninetieth
one undredth
|
21st
22nd
23rd
35th
101st
|
twenty-first
twenty-second
twenty-third
thirty-fifth
one hundred and first
|
1000th→one thousandth, 1000000th →one millionth., 第703→the seven hundred and third,
第5480→the five thousand four hundred and eightieth.
3、注：(1)兩位以上的序數詞僅個位數部分用序數詞,其余部分仍用基數詞。如：thirty-sixth,
(2) 使用序數詞時一般加定冠詞the. 如：I’m in the third grade.
(3) 序數詞作“幾分之幾”講時,有復數形式。如：1/5→one fifth ; 2/3→ two thirds ; 4/7→ four sevenths ; 1/2→ a half ; 1/4→a quarter ; 3/4→ three quarters ; 50%→ fifty hundredths ( fifty per cent).
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