序數 ordinal numbers -

這篇提到的序數，在講述日期、樓層、年級、世紀、

順序時會用到，一樣在開始之前要先熟讀英文數字的內容喔 !

1st first

2nd second

3rd third

4th fourth

5th fifth

第一 third

第二 second

第三 third

4到19都是原本的數字加上th，有加底線的是稍為有點變化的

4th fourth	12th twelfth
5th fifth	13th thirteenth
6th sixth	14th fourteenth
7th seventh	15th fifteenth
8th eighth	16th sixteenth
9th ninth	17th seventeenth
10th tenth	18th eighteenth
11th eleventh	19th nineteenth
基本上就是字尾加上一個 th [θ] 音

20, 30 …到 90 都是原本的 twenty, thirty.. 去 y加 ieth，tieth 的念法為 [tɪəθ]

20th twentieth	60th sixtieth
30th thirtieth	70th seventieth
40th fortieth	80th eightieth
50th fiftieth	90th ninetieth

幾十幾的時候規則比較特別

21 twenty-one 前面不用改，只需要把後面改成序數就好，也就是one改成 first

21^st	twenty-first
22^nd	twenty-second
23^rd	twenty-third
24^th	twenty-fourth
25^th	twenty-fifth
26^th	twenty-sixth
27^th	twenty-seventh
28^th	twenty-eighth
29^th	twenty-ninth

#重點整理

講幾十的時候，原本的 twenty, thirty.. 去 y 加 ieth

講幾十幾的時候，前面不用改，只需要把後面改成序數就好

練習
31st thirty-first	63rd sixty-third
48th forty-eighth	76th seventy-sixth
59th fifty-ninth	82nd eighty-second

樓層也是使用序數	On the 序數 floor.
On the first floor.	On the third floor.
On the second floor.	On the forth floor.

年級	年級有3種表達法
1. S beV in序數 grade.	She is in second grade.
2. S beV in grade 數字.	She is in grade two.
3. S beV a序數 grader.	She is a second grader.

練習
He is in third grade.	My daughter is in fifth grade.
He is in grade three.	My daughter is in grade five.
He is a third grader.	My daughter is a fifth grader.

世紀	in the 序數 century
in the 21st century	in the 9th centur

1st first

2nd second

3rd third

4th fourth

5th fifth

第一 third

第二 second

第三 third

4到19都是原本的數字加上th，有加底線的是稍為有點變化的

4th fourth

12th twelfth

5th fifth

13th thirteenth

6th sixth

14th fourteenth

7th seventh

15th fifteenth

8th eighth

16th sixteenth

9th ninth

17th seventeenth

10th tenth

18th eighteenth

11th eleventh

19th nineteenth

基本上就是字尾加上一個 th [θ] 音

20, 30 …到 90 都是原本的 twenty, thirty.. 去 y加 ieth，tieth 的念法為 [tɪəθ]

20th twentieth

60th sixtieth

30th thirtieth

70th seventieth

40th fortieth

80th eightieth

50th fiftieth

90th ninetieth

21st

twenty-first

22nd

twenty-second

23rd

twenty-third

24th

twenty-fourth

25th

twenty-fifth

26th

twenty-sixth

27th

twenty-seventh

28th

twenty-eighth

29th

twenty-ninth

練習

31st thirty-first

63rd sixty-third

48th forty-eighth

76th seventy-sixth

59th fifty-ninth

82nd eighty-second

樓層也是使用序數

On the 序數 floor.

On the first floor.

On the third floor.

On the second floor.

On the forth floor.

年級

年級有3種表達法

1. S beV in序數 grade.

She is in second grade.

2. S beV in grade 數字.

She is in grade two.

3. S beV a序數 grader.

She is a second grader.

練習

He is in third grade.

My daughter is in fifth grade.

He is in grade three.

My daughter is in grade five.

He is a third grader.

21^st

22^nd

23^rd

24^th

25^th

26^th

27^th

28^th

29^th

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