小学英语语法系列基数词-15序数词详细讲解-下载

序数词的定义
• 表示数目顺序的词用序数词。例如: first 第一，fifth 第五
序数词的构成
• first 第一 second 第二 third 第三 fourth 第四 fifth 第五 sixth 第 六 seventh 第七 eighth 第八 ninth 第九 tenth 第十 eleventh 第十 一 twelfth 第十二 thirteenth 第十三 nineteenth
• I was born in Oct.11,1956. 我出生在一 九五六年，十月，十一日。
• You could see many flowers in June. 六 月份你可以看到好多花。
• 3) 表示“几点钟，几点过几分”用基数词 。
• It's three o'clock. 现在是三点钟。 • It is two to two. 现在是两点差两分。
什么是数词？
• 表示数目多少或顺序多少的词叫数词 ，数词分为基数词和序数词。表示数 目多少的数词叫基数词；表示顺序的 数词叫序数词。
•
基数词
eight
one two
five
four three
seven six
zero one nine eight
seven six
two three four
five
Five. 今天我们要学习第五课。 • Please open your books at page ten. 请
打开书，翻到十页。 • We live in Room 101. 我们住在101房间
。
• 2) 表示“年，月，日”时用基数词。
• The accident took place in 1982. 这次事 故发生在一九八二年。
thirty---thirtieth fifty---fiftieth seventy---seventieth ninety---ninetieth
second
first
third
tenth
fourth
ninth eighth
fifth
sixth seventh
second
first
third
1,000,000,000
4
one billion
Can you read them ?
billion million thousand
100 2,000 30,000 400,000 5,000,000 60,000,000 700,000,000 8,000,000,000 90,000,000,000 100,000,000,000
Let’s review
ten sixty
thirty
forty
seventy
One hundred
eighty
fifty
ninety
twenty
Dragon • 1-100
1
100 Look and Read
one hundred
1,000
2
one thousand
3 1,000,000 one million
What is the largest / smallest 4-digit number?
9831
1389
8 193
Let’s do a practice!
face to face number to number
序数词的含义
表示次序的数词叫序数 词，是由基数词变化而 来的。
one
first
Which day?（哪一天？） It’s in June 2nd.
June the second
When is Teacher’s Day?
It’s September10th .
When is National Day?
• It’s October 1st.
When is Independence Day?
• One-fifth of the books are mine. 三分之 一的书是我的。
• Three-tenths of water is disappeared. 十分之三的水不见了。
• 8) 表示有小数的词用基数词。 • 5.5 five point five • 12.135 twelve point one three five
1st
two
second 2nd
three
third 3rd
four
fourth 4th
序数词的变化
• 1 one -----first • 2 two------second • 3 three----third • 4 其余的序数词都是由基数
词后加-th 变化而来的吗？
eight
twelve
• 6) 表示百分数用基数词。
• Thirty percent of them is water. 它们当 中有30%的水。
• Eighty percent of what he said is true. 他的话有80%是真实的。
• 7) 表示分数时，分子数字用基数词, 但 分母要用序数词, 如分子不是1，序数词 要用复数形式。
Step4:one hundred and three
Look and Practice
625 six hundred and twenty-five
8,961 eight thousand, nine hundred
and sixty-one 95,680
ninety-five thousand, six hundred and eighty
于五。
• 5) 表示大几倍或者小几倍用基数词。
• This river is two times longer than that one. 这条河比那条河长两倍。
• This box is five times less than that one. 这个盒子比那个盒子小五倍。
• Five times six is thirty. 五乘以六得三十 。
6,302,L8o7o6k and Practice
six million, three hundred and two thousand, eighty hundred and seventy-six
45,690,510,810 forty-five billion ,six hundred and ninety million, five hundred and ten thousand ,eight hundred and ten
zero one two
nine
three
numbers
eight
four
seven six five
最基本的数词如下:
• 1 one, 2 two, 3 three, 4 four, 5 five, 6 six, 7 seven, 8 eight, 9 nine, 10 ten, 11 eleven, 12 twelve, 13 thirteen, 14 fourteen, 15 fifteen, 16 sixteen, 17 seventeen, 18 eighteen, 19 nineteen, 20 twenty, 30 thirty, 40 forty, 50 fifty, 60 sixty, 70 seventy, 80 eighty, 90 ninety,
美国独立日 It’s__Ju_ly_4_th_.
基数词变序数词歌
基变序，有规律：
词尾加上th（fourth，sixth） 一、二、三，特殊记；
结尾字母t，d，d（first，second，third）; 八减t，九去e （eighth，ninth）; ve要用f替（fifth，twelfth）; ty将y变i； th前面有个e。 若是碰到几十几，
Numbers are widely used.
Hello ， 86861873 ---
• 1-10
Let’s count!
• one two three four five
• six seven eight nine ten
11-19 eleven twelve thirteen forteen fifteen sixteen seventeen eighteen nineteen
一千亿
one hundred billion
数十/百/千/百万tens/ hundreds/thousands/ millions of
123 ,456 , 789 , 103
Step1:one hundred and twenty-three billion,
Step2:four hundred and fifty-six million, Step3:seven hundred and eighty-nine thousand,
• 3) 几十几的序数词，只是把个位数变成 序数词，十位数不变。
• 为了更简单地记忆，你只要记住下面这 个基数词变序数词口诀就可以了：
• 1，2，3全都变，9少e，8少t，ve变f，ty 变成tie，th最后加上去。
•
A:When is your birthday?
B:My birthday is in .
Can you write their ordinal numbers?
hundred
看谁译得快：
一百
one hundred
一千
one thousand
一万
ten thousand
十万
one hundred thoon
一千 万
ten million
一亿
one hundred million
十亿
one billion
一百亿
ten billion
• 100 a hundred, 1,000 a thousand, 1,000,000 a million, 1,000,000,000 a billion.
从事物内容上分析，基数词用 在下列情况。
• 1) 编号的事物用基数词。 • Today we are going to study Lesson
five nine
8 th 5 th eighth
fifth
12th
9th twelfth ninth
twenty
twentieth 20th
整十的序数词把 y 变成 i加-eth
• twenty----twentieth
Can you read?
•1 thirty----thirtieth •2 forty----fortieth •3 fifty -----fiftieth
• 第十九 twentieth 第二十
• fortieth 第四十 fifty-first 第五十一 eight-third 第八十三
• ninety-fourth 第九十四
• 1) 序数词1—19 除第一，第二，第三， 第五，第八，第九，第十二变化不规则 外，其余均由在基数词后加上-th。
• 2) 十位整数的序数词的构成方法是, 是 将十位整数基数词的词尾y 变成 i 再加 eth。
前用基来后用序。
序数词
•one ---first three---third five---fifth seven---seventh
nine---ninth
two---second four---fourth six---sixth eight---eighth •ten----tenth
twenty---twentieth forty---fortieth sixty---sixtieth eighty---eightieth
• We arrived in Beijing at five to seven. 我们七点差五分到达北京。
• 4) 用于加减乘除的数字用基数词。 • One plus two is three. 一加二等于五。 • Eight minus four is four. 八减四等于四
。
• Two times two is four. 二乘二等于四。 • Ten divided by two is five. 十除以二等
tenth ninth
ordinal numbers
eighth seventh
fourth fifth sixth
ordinal numbers(序数词 )
一、二、三，特殊记， 加th从4起， 八少“t”，九去“e”， “ve”要用“f”替，(five, twelve) 见“y”变成“i”和“e”，词尾加上 “th”， (twenty,thirty,---ninety) 若是遇到几十几，只变个位就可 以。