小升初专项复习——数词（共17张PPT）

(共17张PPT)
小升初
词汇
数词
数词的分类
数词是表示数目和顺序的词，可分为基数词和序数词。
基数词表示数目，序数词表示顺序。
基数词的构成
注：hundred（百），thousand（千），million（百万），billion（亿）等前面即使有具体的数词，也不能在它们后面加s.
如：600-six
hundred,
8百万-eight
million.
基数词
变化特点
例词
1~12
独立的单词
one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve
13~19
以－teen结尾
如：fourteen,
seventeen等。13,15,18
较特殊,13-thirteen,
15-fifteen,
18-eighteen
20~90的整十位数
以－ty结尾
如：
sixty,
ninety.
但20,30,40,50,80较特殊，20-twenty,
30-thiry,
40-forty,
50-fifty,
80-eighty
21~99
在整十和个位数之间加连字符“－”
28
twenty-eight
96
ninety-six
101~999
在百位和十位（若无十位，则和个位）之间加
and
148
one
hundred
and
forty-eight
406
four
hundred
and
six
序数词的构成
注：序数词前常用定冠词the,
有时还可以用不定冠词a/an表示“又一”的意思
Mr.
Li
has
a
second
car.
李先生另外还有一辆车。
序数词
变化特点
例词
一般情况
在基数词词尾加－th
four-fourth,
ten-tenth
特殊情况
无规律，需要记忆
one-first,
two-second,
three-third,
five-fifth,
eight-eighth,
nine-ninth,
twelve-twelfth
以ty结尾的单词
先变y为i,
再加－eth
thirty-thirtieth,
fifty-fiftieth
以one,two,three
等结尾的多位数词
将个位数变成序数词
twenty-one——twenty-first,
one
hundred
and
one——
one
hundred
and
first
数词的应用
1.时刻的表达
点钟、分钟、秒钟要用基数词。
（1)
"几点钟＂用基数词加o'clock,
o'clock
可省略。如：5点钟－five
(o'clock)
.
（2)
“几点过几分，≤30分钟”用介词
past.
如：6:
05-five
past
six;
8:
15-fifteen（a
quarter)
past
eight;
7:
30-half
past
seven.
（3)
“差几分几点，＞
30分钟”用介词“to”。
如：6:
40-twenty
to
seven;
6:
45-fifteen（a
quarter)
to
seven.
（4)
日常生活中的时间读法常常简化，直接按基数词的顺序读。如：6:
05-six
o
five.
2.年月日的表达
（1)
年份用基数词。如：2000-two
thousand;
1905-nineteen
o
five.
（2)
年用基数词，日用序数词。
如：2011年5月8日
写作：May
8,
2011;
读作：May
the
eighth,two
thousand
and
eleven
或
the
eighth
of
May,two
thousand
and
eleven.
3.世纪、年代表达
（在）90年代（in)
the
nineties
（在）19世纪（in)
the
nineteenth
century
（在）18世纪30年代（in)
1730s/1730's
4.
编号的表达
（1)
Lesson
One=the
first
lesson
第一课。
（2)
Bus
No.
2=the
No.
2
bus
2路公共汽车。
（3)
表示住所时不用“No.
”。如：302
房间－Room
302
(读作：room
three
o
two)
.
（4)
如果数字编号比较长，一般用基数词。如：第457
页－Page
457.
（5)
电话号码用基数词。如：3855633-three
eight
five
five
(double
five)
six
three
three（double
three)
.
5.
分数的表达
（1)
分子用基数词，分母用序数词，分子大于“1”时，分母则加“s”。
如：1/3-one
third,
2/3-two
thirds.
（2)
1/2-a
(one)
half;
1/4-one
fourth
或a
(one)
quarter;
3/4-three
fourths
或
three
quarters.
（3)
half
a
second-二分之一秒；a
quarter
of
a
second-四分之一秒。
6.
小数的表达
小数要用基数词。如：5.5-five
point
five.
7.
百分数的表达
百分数要用基数词。如：5%-five
percent；
0.8%-zero
point
eight
percent
.
8.
其他用法
（1)
基数词＋单数名词＋形容词构成合成形容词。如：a
five-year-old
boy一个五岁的男孩。
（2)
具体数词＋metre
(s)
/kilometre
(s)
/kilo
(s)
long/high/tall/deep/away等。如：
The
Changjiang
River
is
6,
300
kilometres
long.
长江长6300公里。
（3)
表达“几十岁”用序数词。如：in
his
thirties
在他三十几岁时。
（4)
倍数的表达。一倍用once,
两倍用
twice,
两倍以上用基数词＋times.如：five
times5倍。
一、把下列基数词改为序数词
1.
one
________
2.
two
_________
3.
three
_________
4.
five
_________
5.
eight
_________
6.
nine
________
7.
twelve
__________
8.
fourteen
_________
9.
twenty
_________
10.
twenty-one
________
11.
forty-five
_________
12.
ninety-
nine
_________
Keys:
1.
first
2.
second
3.
third
4.
fifth
5.
eighth
6.
ninth
7.
twelfth
8.
fourteenth
9.
twentieth
10.
twenty-first
11.
forty-fifth
12.
ninety-ninth
二、单项选择
(
)
1.
—What's
thirty
and
twelve?
—
It's
_______.
A.
forty-two
B.
forty-one
C.
forty
two
(
)
2.
—
What
day
is
it
today?
—
________.
A.
Monday
B.
Sunny
C.
May
1
(
)
3.
—
______is
your
new
bag?
—
Eight
yuan.
A.
How
many
B.
How
much
C.
How
old
(
)
4.
Twenty-eight
minus（减）six
is
_______.
A.
the
twenty-second
B.
twenty-
two
C.
twenty-
second
(
)
5.
My
sister's
birthday
is
on
_______
of
September.
A.
first
B.
three
C.
the
second
Keys:
1.
A
2.
A
3.
B
4.
B
5.
C
(
)
6.
Eight
and
eleven
is
_______.
A.
nineteen
B.
thirteen
C.
fifteen
(
)
7.
There
are
_______
days
in
a
year.
A.
three
hundred
and
sixty-five
B.
three
hundred
and
sixty
C.
three
hundred
(
)
8.
October
_______
is
National
Day.
A.
the
first
B.
the
second
C.
the
third
(
)
9.
—How
______
teachers
do
you
have?
—
Six.
A.
often
B.
many
C.
much
(
)
10.
Four
plus（加）______
is
twelve.
A.
seven
B.
eight
C.
nine
Keys:
6.
C
7.
A
8.
A
9.
B
10.
B
三、
根据句意填上合适的英文数词
1.
There
are
________
days
in
a
year.
2.
There
are
________
months
in
a
year.
3.
There
are
________
or
_______
days
in
a
month.
4.
There
are
________
hours
in
a
day.
5.
There
are
________
minutes
in
an
hour.
Keys:
1.
three
hundred
and
sixty-five
2.
twelve
3.
thirty;
thirty-one
4.
twenty-four
5.
sixty
四、用英语表示下列时间
(1)
2:35
_________
(2)
8:12
_________
(3)
9:06
_________
(4)
7:45
_________
(5)
3:30
_________
(6)
12:00
_________
(7)
10:55
_________
(8)
6:15
_________
Keys:
1.
a
quarter
to
three/
fifteen
to
three
2.
twelve
past
eight
3.
nine
o
six
/
six
past
nine
4.
a
quarter
to
eight
/
fifteen
to
eight
5.
half
past
three
/
thirty
past
three
6.
twelve
o'clock
7.
five
to
eleven
8.
a
quarter
past
six
/
fifteen
past
six
五、按要求完成句子
1.
Lily
watches
football
games
at
four
fifty-five.
（同义句转换）
Lily
watches
football
games
at
________
________
________
.
2.
I
go
to
school
at
seven
thirty
on
weekends.（对画线部分提问）
_________
________
you
_________
to
school
on
weekends?
3.
When
is
National
Day
in
China?
（回答问题）
It's
_______________________.
4.
When
is
Children's
Day?
（回答问题）
It's
_______________________.
5.
When
is
your
birthday?
（回答问题）
__________________________.
Keys:
1.
five
to
five
2.
When
do;
go
3.
October
first
/
the
first
of
October.
4.
June
first
/
the
first
of
June.
5.
略