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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:
Fill the table with the correct ordinal form of numbers 1, 2, and 3.
| number | written |
|---|---|
1st | |
second | |
3rd |
Sort the ordinal numbers for 4 to 10 in the correct order.
Match each number with its written ordinal form.
Choose the correct spelling for the numbers 5th, 9th, 12th, and 20th.
fiveth, nineth, twelveth, twentyth
fivth, nineth, twelveth, twentith
fifth, ninth, twelfth, twentieth
fivest, nineth, twelfth, twentith
Fill the blanks with the written ordinal form of the numbers in parentheses.
The
(8) book on the shelf is my favorite.
She finished
(2) in the race, just behind her friend.
The
(1) team to score was the home team.
He was the
(5) person to arrive at the party.
The
(20) day of the month is a holiday in our country.
It was the
(3) time I had visited that city.
The
(10) house on the street is painted blue.
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