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Unit 4Unit 4The world of numbers
Imperative sentencesImperative sentences
Be quite.Please have a seat.Sun Fei, pay attention.Don’t be afraid.Please do not shout.ChenYu, don’t be late.
We use imperative sentences to tell people do or not do something. We often make instructions more polite by starting with please.
祈使句 ( imperative sentences ) 一般以动词的原形开头，表示命令，要求，命令，要求，请求或劝告请求或劝告等。要表示委婉语气时用 please 。动词祈使式与动词原形形式相同，但没有时态和复数的词形变化。祈使句一般用降调。
1.1. 肯定结构及强调形式。肯定结构及强调形式。
2. 2. 否定结构。否定结构。
1.Be a good student.
2.Please come in.
1.Don’t do that again.
2.Don’t come in, please.
把下列句子变成否定句：
1.Have a seat, please.
2. Be quiet.
3. Open the door, please.
4. Help yourself to some fish.
Don’t have a seat, please.
Don’t be quiet.
Don’t open the door, please.
Don’t help yourself to some fish.
Complete the sentence with imperatives and the proper form of the verbs in brackets.1. – It is her birthday next week. -- Then ____________ (not tell) her about the surprise party.
2. – How can I get to People’s hospital? -- _______ (go) along the street and _______ (turn) left at the lights.
3. – We have to finish the work in two hours. -- Then let’s ______________ (not waste) any time.
4. -- ___________ (not make) so much noise, please. -- OK.
5. -- _______ (look) out ! There is a car coming. -- Thanks.
Don’t tell
go turn
not waste
Don’t make
Look
Numbers: everyone’s language
Match the words with the signs and numbers.
a percentagemultiply, timesdivideadd, plusan odd numberan even numbersubtract, minus
equals
e 25%h Xc ÷
a +
d =g - b 12f 7
加法的表达： 1.A 加 B ：
2.A 加 B =… ：e.g. 3+9 = 12:
Add A and B.
A plus B equals/ is…Add 3 and 9 is 12.
3 plus 9 equals 12.
减法的表达 : 1. B 减 A:
2. B 减 A=
Subtract A from B
B minus A equals…
e.g. 9-3=6 Subtract 3 from 9 is 6
9 minus 3 equals 6.
乘法的表达： 1.A 乘 B ：
2.A 乘 B =… ：
Multiply A by B.
A times B equals/is…
e.g. 7x5= 35: Multiply 7 by B is 35.
7 times 5 equals 35.除法的表达： 1.A 除以 B ：
2.A 除以 B =… ：
Divide A by B.
A divide by B equals/is…
e.g. 6÷2= 3: Divide 6 by 2 is 3.
6 divided by 2 equals 3.
Instructions and statements about numbers
S1 1. _______ 11 _____ 1 2. S_______ 5 _______ 13 3. M________ 7 ________ 8 4. D________ 16 ________ 4 5. A ________ 9 __________ 6 6. A__________ 14 and 4 and d_________the answer by 2. 7. S___________ 9 from19 and m________the answer by 3
Add andubtract fromulpitiply by
ivide bydd and
subtract
ivideubtractultiply
S2 1. 11 _______ 1 _______ ________ 2. ____ m ______ ______ e ____ _____ 3. _____ t ____ _____ e ______ ________ 4. ______ d ____ by _____ e _______ ____ 5. ______ p _____ ____ e_____ _____ 6. _____ p _____ _____ and then d____ by ____ e ____ ______. 7. ______ m _____ ____ and then t ____ ____ e ____ ______.
plus equals 12
13 inus 5 quals 87 imes 8 quals 5616 ivided 4 quals 4
9 lus 6 quals 1514 lus 4 ivided 2 quals 919 inus 9 imes3 quals 30
数
词基数词 序数词
数量
顺序
(1) 1—12 独立成词 .
one two three four five six seven eight nine ten eleven twelve
一 基数词
There are six lions.
There are nine girls.
There are twelve men.
(2) 13—19 -teen 结尾13--thirteen
15--fifteen
18--eighteen
19--nineteen
14--fourteen
How old are you?
I am…
What is ten and eight? It’s eighteen
seven six
three nine
five twelve
Work in pairs
(3) 表示“十”的基数词 20—90 --ty 结尾 .
20—twenty
30---thirty
40—forty
50—fifty
90—ninety
Try your best ! speak loudly and quickly!
test
1440
50
15
17
70
90
19
18
80 60
16
(4) 21—99
22
33 thirty-three
44 forty-four
55 fifty-five
99 ninety-nine
twenty-two
21 twenty-one
(5) 101—999
101– one hundred and one
840 eight hundred and forty
693 six hundred and ninety-three
301 three hundred and one
(6) thousand
7,000 --- seven thousand
16,000 sixteen thousand
80,000 eighty thousand
140,000 50,000 3,000
（ 1 ）年份的表达法（要用基数词，每两位一读。）
1999—nineteen ninety-nine
1875-- eighteen seventy-five
2007-- two thousand and seven
2008-- two thousand and eight
1768 2005 sixteen eighty-two
nineteen seventy-four
小知识
（ 2 ）时刻的表达法： ( 用基数词表示） 8:35—eight thirty-five
6:20-- six twenty
7:05-- seven five
10:16-- ten sixteen
11:30-- eleven thirty
12:48-- twelve forty-eight
---When were you born?
---I was born in 1982
---When do you usually get up /have lunch/have supper?
---I usually get up at 7:00
practise
基变序有规律，词尾加上“－ th” ．
“ 一，二，三”，特殊记，面目全非要注意。
八去 t ，九减 e ，遇到 y 变 -ie.
若是 -ve 来结尾，变成 f 莫迟疑。
“ 五，八，十二”和第九，拼写变化要注意。
序数表示“第几十几”，“个位”变序就可以。
序数词缩写记清楚，数字后跟两字母。
二 序数词
four fourth
six sixth
eight eighth
nine ninth
five fifth
one first
two second
three third
seven seventh
ten tenth
twelve twelfth
twenty twentieth
forty fortieth
twenty-one twenty-first
thirty-two thirty-second
one hundred and ninety-eight
one hundre and ninety-eighth
序数词缩写形式
first 1st
second 2nd
third 3rd
fourth 4th
twenty-third 23rd
eithty-eighth 88th
日期的表达法： （月 + 日的序数词）
10 月 5 日— October fifth /5th (October the fifth / the fifth of October)
7 月 20号 --
July twentieth/20th
(July the twentieth/ the twentieth of July)
1 月 1号
2 月 5 号 8 月 22号
12 月 23号
January twelfth/12th,2007
小知识
二 过关训练单项选择。
1.Monday is__ ___day of the week.
A. two B. second C. the second D. the first
2. I think the___ _ lesson is very easy to learn.
A. eleven B. eleventh C. eleventh of
3. This is my _______English teacher.
• first B. the first C. first of
4. –What is the date today?
_ _______________.
• It is Friday B. It is the fifth day C.It is March fifth
5.Plaese turn to Page _______ and look at the _______picture.
A. Thirty; second B. Thirty; two C. Thirtieth; second
C
A
C
A
B
