新人教版PEP小学英语五年级下册第四单元第四课时Unit4_when_is_Easter_B_Let&39;s_learn

Unit 4 When is Easter ?B Let’s learn Ask and answer

Flash game3rd first third 5th 2nd

July 5th fourth

1st June 4th

4thfifth

January 3rdsecond February 2nd

August 1st

When is the_____________? It’s on __________________.

表示数目顺序的词叫序数词。 例如:第一，第二，……第一第二 第三 第四

第五

first第六

second第七

third第八

fourth fifth (ve变f)第九 第十

sixth

seventh

eighth (-t)

ninth (-e)

tenth

特殊变化的：第一，第二，第三(结尾 t,d,d),第五，ve要用f替);第八(减t), 第九(减e), 其他的序数词要在基数词后面+th

数字 基数词 序数词

11 eleven eleventh

12 twelve twelfth

13

14

thirteen fourteen thirteenth fourteenth

在11-19的序数词里面，只有第十二的变化最为特殊，twelfth 15 fifteen 16 17 18 19

sixteen

seventeen eighteenseventeenth

nineteen

fifteenth sixteenth

eighteenth nineteenth

1)在第1到第19之间： 特殊变化的：第一，第二，第三，第五，

第八，第九,第十二 2)其他的序数词要在基数词后面+th

数字 基数词

20

30

40

50

twenty thirty60 70

forty80

fifty90

数字 基数词

sixty

seventy eighty ninety

十位整数的序数词的构成方法:是将十位整数的词尾 -y ,变成 i和e 再加 –th;

例如：twenty ----twentieth

基数词

twenty

thirty

fortyfortieth

fifty

序数词 twentieth thirtieth 基数 词 序数 词

fiftieth ninety

sixty sixtieth

seventy

eighty

seventieth eightieth ninetieth

几十几(例如32 ,68等)序数词变化方法： 只是把个位数变成相应的序数词, 十位数不变

例如：21: twenty-one

twenty-first fifty-thirdsixty-sixth

53: fifty-three66: sixty-six

China’s May Day National April Fool’s Day Day New year’s Children’s Day When is ___________________? June 1st It’s on ____________________ April May 1st 1st February 1st October 1st

When is Tree Planting Day ? It’s on March 12th .

When is Christmas ? It’s on December 25th.

When is your birthday?

It’s on August 21st.

twenty-one

twenty-first21st

When is grandpa’s birthday?

It’s on October 12th.

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