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序数とは何ですか？
序数は、誰かや何かのリスト上での位置や順番を示します。レッスンに従って、英語で序数がどのように形成されるかを学びます。
1から3までの序数の書き方
「one」、「two」、「three」の序数は独自の形を持っています。
序数（数字） | 序数（文字） | |
|---|---|---|
1 | 1st | first (初め) |
2 | 2nd | second (二番目) |
3 | 3rd | third (三番目) |
This is my first time here.
ここに来るのはこれが初めてです。
She is the second child.
彼女は二番目の子どもです。
4から10までの序数の書き方
「four」、「five」、「six」など他の数の序数を表すには、単に語尾に「th」を追加します。
数字 | 文字 |
|---|---|
4th | fourth (4番目) |
5th | fifth (5番目) |
6th | sixth (6番目) |
7th | seventh (7番目) |
8th | eighth (8番目) |
9th | ninth (9番目) |
10th | tenth (10番目) |
Turn at the fourth corner.
4番目の角を曲がってください。
Bring me the eighth book.
8冊目の本を持ってきてください。
注意！
Some words have spelling changes. For example:
five+th → fifth
第五の
nine +th → ninth
第九の
11から20までの序数の書き方
「eleven」、「twelve」、「thirteen」などの数も語尾に「th」を追加します。
数字 | 文字 |
|---|---|
11th | eleventh (11番目) |
12th | twelfth ( 12番目) |
13th | thirteenth (13番目) |
14th | fourteenth (14番目) |
15th | fifteenth (15番目) |
16th | sixteenth (16番目) |
17th | seventeenth (17番目) |
18th | eighteenth (18番目) |
19th | nineteenth (19番目) |
20th | twentieth (20番目) |
He won the eleventh race.
彼は11回目のレースで勝ちました。
注意！
ここでもスペル変更に注意してください。例えば：
twelve + th → twelfth
12番目
twenty + th → twentieth
20番目
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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