资源简介

(共26张PPT)
Exploring the Topic:
Grammar in Use
(Numbers & Imperative sentences)
Unit 8 Our Blue Planet
结合图片和文字描述，在语境中理解并学会如何使用基数词来表达数量；
2. 结合语境运用所学语法知识，掌握祈使句的形式、意义和用法；
3. 通过人与自然相关话题讨论，了解节约水的重要性，树立水资源保护意识，养成节约用水的习惯。
Can you remember these pictures Thinking about what we can do to save water.
e.g. Turn off the tap while brushing your teeth...
Reuse water...
Numbers
Look at the pictures and read the sentences. Pay attention
to the numbers.
Activity 1
The Qinghai Lake
covers about 4,600
square kilometers.
The coastline of
the Arctic Ocean
is about 45,390
kilometers long.
The Changjiang
River is about
6,300 kilometers
long.
The Atlantic Ocean
covers more than
93,000,000 square
kilometers.
We use a comma every 3
digits from the right when
the number is greater than 999.
TIPS
Numbers
词汇、短语积累
cover 覆盖
The coastline of the Arctic Ocean
北冰洋海岸线
The Changjiang River 长江
The Atlantic Ocean 大西洋
Numbers
基数词！是什么样的词呢？
？
概念：基数词是表示数量多少的词，用来描述可数名词的数量。
比如“one(1)、two(2)、three（3）......hundred（百）、thousand（千）、million（百万）、billion（十亿）” 等，主要用于计数。
数字大于等于2时，后面的名词需要变复数。
e.g. 我有三个苹果。 I have three apples.
桌子上有五本书。There are five books on the desk.
Numbers
（1）0-12
千位以内的基数词构成
（2）13-19
0 1 2 3 4 5 6
zero one two three four five six
7 8 9 10 11 12
seven eight nine ten eleven twelve
13 14 15 16 17 18 19
thirteen fourteen fifteen sixteen seventeen eighteen nineteen
Numbers
千位以内的基数词构成
（4）21-99（非整十：十位数和个位数之间加连字符“-”）
（3）20-90（整十数，以ty结尾）
20 30 40 50 60 70 80 90
twenty thirty forty fifty sixty seventy eighty ninety
e.g. 21 twenty-one; 49 forty-nine 54 fifty-four
（5）101-999 (百位数和十位数之间加“and”)
e.g. 123 one hundred and twenty-three 456 four hundred and fifty-six
Numbers
千位以内的基数词的构成规律
总结:
英语基数词的构成有一定的规律。1 到 12 是独立的单词，13 到 19 一般是在个位数词的词尾加 -teen 构成，20 到 90 整十位数通常是在个位数词的词尾加 -ty 构成，两位数的表示方法是整十位数和个位数之间用连字符 “-” 连接，三位数的表示方法是在百位和十位（若无十位则和个位）之间用 “and” 连接。
你能发现哪些千位以内的基数词的构成规律吗？
Numbers
拓展：整百的基数词构成
注意：
hundred，thousand，million, billion在合成数词中一般用单数形式，但是用来表示不确定的数目时，用作复数形式且和介词 of 连用。
固定搭配：具体数字＋hundred/thousand/million/billion+可数名词复数
“...百/千/百万/十亿”
hundreds/thousands/millions/billions＋可数名词复数
“数百.../数千.../数百万.../数十亿...”
百、千、百万、十亿
100 1,000 1,000,000 1,000,000,000
百 千 百万 十亿
选择题。
( )1. “Two hundred and thirty” is equal to the number ______.
A. 203 B. 230 C. 320
( )2. There are ______ days in a year. Usually it’s 365, but in a leap year it’s 366.
A. three hundreds and sixty-five B. three hundred and sixty-five
C. three hundred and sixty five
( )3.Which of the following is correct
A. 789 is read as “seven hundreds and eighty-nine”
B. 123 is read as “one hundred and twenty-three”
C. 605 is read as “six hundred fifty”
Numbers
B
B
B
你答对了吗？
填空题。
1. _____________（Hundred / Hundreds）of people attended this meeting.
2.There are about three ____________ (hundred / hundreds) students in our school.
3. The company made two __________ (billion / billions) dollars in profit(收益）last year.
4. ___________ (Billion) of bacteria（细菌）exist in our body.
5. The project will cost about ten _________ (million / millions) yuan.
Numbers
Hundreds
hundred
billion
Billions
million
Numbers
千位以上英文数字的读法
千位以上英文数字的读法通常遵循一定的规则,即每三位数为一个单位,用逗号隔开,从右往左依次是 thousand(千)、million(百万)、billion(十亿)。
e.g.
3,500:读作“three thousand, five hundred”
12,345:读作“twelve thousand, three hundred and forty-five
2,345,600:读作“two million, three hundred and forty-five thousand, six hundred”
12,345,678,900: 读作“twelve billion, three hundred and forty-five million, six hundred and seventy-eight thousand, nine hundred”
Numbers
Read the numbers and complete the table.
Activity 2
4,186 four thousand, one hundred and eighty-six
45,390 forty-five __________, three __________ and ninety
6,363,000 six million, three hundred and sixty-three thousand
1,386,000,000 one billion, three hundred and eighty-six __________
909,090,009,900 nine hundred and nine __________, ninety __________,
nine __________, nine hundred
billion
million
hundred
million
thousand
thousand
选择题。
( )1.They have sold ______ computers this month.
A. one thousand and fifty B. one thousand fifty
C. one thousands and fifty D. one thousands fifty
( )2.— Can you read 48,162
— Sure. It’s ________.
A. forty-eight thousand, one hundred sixty-two
B. forty-eight thousand, one hundred and sixty-two
C. forty-eight thousand and one hundred and sixty-two
Numbers
A
B
你答对了吗？
Complete the sentences with the numbers in the brackets.
Numbers
Activity 3
1. Antarctica is about ____________________________________________ (14,200,000) square kilometers in size, and ice covers about 98 percent of the land.
2. The Sea of Marmara is about ____________________________________ (11,350) square kilometers.
3. Oceans cover about ____________________________________________
(360,000,000) square kilometers of the earth.
4. There are about ___________________________ (307,000,000) lakes in the world.
fourteen million and two hundred thoudsand
three hundred and sixty million
eleven thousand, three hundred and fifty
three hundred and seven million
Imperative sentences
Pair work. Read the conversation. Pay attention to the imperative sentences.
Come in, please.
Miss Wang, here
is the poster about
saving the ocean.
Can I put it on this
table
Oh, don’t put
it here. Please
put it on that
big chair.
Activity 1
(Xiao Ya is knocking on the door.)
put on 穿上；上映 put up 张贴 put off 延误，推迟 put down 放下，记下
Imperative sentences
祈使句
定义：一般以动词原形开头，无时态和数的变化，没有主语，用来表示命令、建议、请求、禁止、警告、劝告等的句子。
类型：
(1)肯定祈使句。 e.g. Listen to me. 听我说。
(2)否定祈使句。 e.g. Don’t talk loudly. 不要大声讲话。
Imperative sentences
肯定（Positive）祈使句
肯定祈使句的句式结构：
（1）动词原形+其他。
e.g.Come here. 过来。
（2）Let+宾语+动词原形+其他。
e.g.Let me play the piano.
让我弹一下钢琴。
（3）Be+表语+其他。
e.g. Be quiet. 安静。
Imperative sentences
否定（Negative）祈使句
否定祈使句的句式结构：
（1）Don’t+肯定祈使句。
e.g. Don’t play with fire. 不要玩火。
（2）Let+宾语+not+动词原形。
e.g. Let him not stand in the rain. 不要让他站在雨中。
（3）Never+动词原形。
e.g. Never come late. 永远不要迟到。
（4）No+(动)名词。
e.g. No smoking. 不要吸烟。
选择题。
( )1.Let’s ______ basketball after school.
A. play B. to play C. playing D. plays
( )2.______ me the truth, or I’ll be angry.
A. Telling B. To tell C. Tell D. Told
( )3.______ late for school again, Tom.
A. Not be B. Don’t be C. Be not D. Aren’t
( )4.Please ______ the window before you leave the classroom.
A. closing B. to close C. close D. closed
A
B
你答对了吗？
Imperative sentences
C
C
Complete the table and learn how to use imperative sentences
Activity 2
4,186Positive Negative
______every drop of water. Don’t _______ waste into the lake.
______enough water. _______ waste water.
Save water, save our planet! No _________ in that lake.
______your step! The floor is wet. Never ________ the water running.
Let’s ______a poster about saving water. Let’s not ________ here!
Don’t
Imperative sentences
Save
Drink
Mind
make
throw
swimming
keep
speak
Match the pictures with the words or phrases, and then make
imperative sentences.
take a shower
Activity 3
Imperative sentences
litter
swim
fish
collect
turn off
· Turn off the tap while brushing teeth. 在刷牙的时候关掉水龙头。
· Don’t litter around. 不要到处扔垃圾。
· …
根据汉语意思补全句子。
Activity 3
1.请打开灯。
Please ______ on the light.
2.请小心！（Be+表语+其他）
______ careful(小心的), please!
3.不要在图书馆里吃东西。（使用Don’t+肯定祈使句）
______ ______ in the library.
4.永远不要在不戴头盔的情况下骑自行车。（使用Never+动词原形）
______ ______ a bike without wearing a helmet.
turn
Don’t
Be
eat
Imperative sentences
Never
ride
1. 通过教材中的活动以及习题的总结，了解了英语中基数词（尤其是千位数以上基数词）的写法和读法；
2. 通过对话练习，掌握了如何使用肯定祈使句和否定祈使句来表示建议、请求、禁止、命令、警告、劝告等；
3. 积累了水资源保护话题相关的一些词汇表达。
1. Try to design a poster on saving water. Pay attention to the usage of imperative sentences.
2. Finish the exercises.

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