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什么是序数词？
序数词表示某人或某物在列表或顺序中的位置。在本课中，你将学习英语序数词的结构。
如何书写序数词：1-3
一、二、三的序数词有独特的形式。
序数词（数字形式） | 序数词（书写形式） | |
|---|---|---|
1 | 1st | first (第一) |
2 | 2nd | second (第二) |
3 | 3rd | third (第三) |
This is my first time here.
这是我第一次来这里。
She is the second child.
她是第二个孩子。
如何书写序数词：4-10
要书写四、五、六等的序数词，只需在数字后面加上 'th'。
序数词（数字形式） | 序数词（书写形式） |
|---|---|
4th | fourth (第四) |
5th | fifth (第五) |
6th | sixth (第六) |
7th | seventh (第七) |
8th | eighth (第八) |
9th | ninth (第九) |
10th | tenth (第十) |
Turn at the fourth corner.
在第四个拐角处转弯。
Bring me the eighth book.
把第八本书拿给我。
注意力！
某些单词的拼写会发生变化。例如：
five + th → fifth
第五
nine + th → ninth
第九
如何书写序数词：11-20
像11、12、13等数字的序数词也在末尾加上 “th”。
序数词（数字形式） | 序数词（书写形式） |
|---|---|
11th | eleventh (第十一) |
12th | twelfth (第十二) |
13th | thirteenth (第十三) |
14th | fourteenth (第十四) |
15th | fifteenth (第十五) |
16th | sixteenth (第十六) |
17th | seventeenth (第十七) |
18th | eighteenth (第十八) |
19th | nineteenth (第十九) |
20th | twentieth (第二十) |
He won the eleventh race.
他赢得了第十一场比赛。
注意力！
再次注意拼写变化。例如：
twelve + th → twelfth
第十二
twenty + th → twentieth
第二十
Quiz:
Which option shows the correct ordinal form of numbers 1 to 3?
oneth, twoth, threeth
onth, twth, thrth
first, second, third
1th, 2th, 3th
Match each cardinal number with its written ordinal number.
Sort the ordinal numbers from 11 to 20 in the correct order.
Fill the blanks with the ordinal form of the numbers in parentheses to complete the story.
The annual city marathon was in two weeks. Last year, Emily finished in
(12) place, but she was aiming for a better position this year. At the beginning of the race, she was at
(3) mark, right behind the fastest runners. By the
(5) mile, she was tired but kept running. When they reached the
(7) mile, Emily saw that she was in
(15) place. She kept running and finally passed a few runners, reaching
(9) position. With only a few hundred meters to go, Emily pushed her limits and sprinted ahead to reach the
(2) place.
Which ordinal numbers have a spelling change in their written form?
5th, 9th, 12th, 20th
5th, 7th, 15th, 19th
4th, 9th, 12th, 20th
6th, 8th, 12th, 16th
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