unit 4 the world of numbers imperative sentences be quite. please have a seat. sun fei, pay...

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