初二物理 液体压强 异形容器问题

There is a meeting every evening.
There are some legs in the classroom.
have 表示拥有，即“某人有……”
I have a round face . Mr. Wu has a square face.
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练习一下
用there be或have/has填空
( ) 1. Jack _______ a big schoolbag. ____________ many pencils in it.
=There are no students in the classroom.
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3.一般疑问句：
① 一般情况：将be 动词提前。
② 含情态动词（如：will），则将情态动词提前。
There is some milk in the glass.
—Is there any milk in the glass? 杯子里有牛奶吗？ 肯定回答： —Yes, there _____. 是的，有。
② ____________________ 对不可数名词进行提问。
e.g. There is a little water in the bottle. _____________________ is there in the bottle?
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练习一下（先熟悉笔记+后做题 共7分钟）
not a/an = no
not any = no
There ___________ a computer in my bedroom.
=There is no computer in my bedroom.
There __________ any students in the classroom.
1. I ________ a good father and a good mother.
2. ____________a Tia on the desk.
3. He _________ an iPad.
4. _____________a basketball on the playground.
否定回答：—No, there _________. 不，没有。
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4. there be句型中对数量进行提问
① ____________________ 对可数名词复数进行提问。
e.g. There are five birds in the tree. 树上有5只鸟。 ____________________ are there in the birds?
先算压强， 后算压力
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1.肯定式： ①There ______ + a/an 可数名词单数/不可数名词 ②There ______ + 可数名词复数
There _____ a handsome man in the classroom.
There ___ an egg on his head.
( ) 4. _______ an orange and two apples in the basket.
A. There are B. There is C. There was D. There were
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易错点注意！！！
There be的时态变化
1. 过去时 There _______ a cinema in our city two years ago. 两年前，我们城市有一家电影院。 There _________ many trees here five years ago. 五年前，这里有很多树。 2. 将来时 There _____________________________ an English party next Saturday. There _____________________________________ a concert this Saturday.
注意：some疑问变any
否定回答：—No, there ____________. 不，没有。
There will be a party tomorrow evening.
—_____there ______ a party tomorrow evening? 明晚将有一个派对吗？
肯定回答：—Yes, there _______. 是的，有。
A. How many B. How much C. How number
D. are D. What many
( ) 3. —_________ there any juice in your glass? —No, __________.
A. Are; there aren’t B. Is; there isn’t C. Are; there not D. Is; there not
10. ______________any books in the bookcase?
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there be和have的区别
There be 就近原则
考点来了 There be肯否疑问
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Let’s practice！练习一下
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单选(10道)（共10分钟）
A. There are B. There is C. There was D. There were
( ) 3. ______ some milk and an egg on the table.
A. There are B. There is C. There was D. There were
There ___ some orange juice in the glass.
There ______ some lovely girls in the classroom.
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There is_______ There are _____
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2.否定式： There be + not + 主语 + 其他
F乙
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如下图，在质量不计、底面积相 等的甲、乙、丙三个容器中，装 入相同质量的不同液体并使液面 在相同高度处
＜ ＜ 液体对容器底部的压强P甲
P乙
P丙
＜ ＜ 液体对容器底部的压力F甲
F乙
F丙
= = 容器对桌面的压强P甲
P乙
P丙
= = 容器对桌面的压力F甲
F乙
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总结一下
A. is
B. are
C. have
D. has
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完成句子
1. There is some soup in the bowl. （改为否定句） (1) _____________ ____________ ___________ soup in the bowl. (2) _____________ ____________ ___________ soup in the bowl. 2. There are four seasons in a year. （改为一般疑问句，并作肯定回答）
____________ _____________ ____________ ____________ in a year? Yes, _____________ _______________. 3. There are five people in Lily’s family. （对划线部分进行提问） __________ __________ people __________ __________ in Lily’s family?
液体压强重难点 之
异形杯问题
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液体压强
产生原因：液体受到 重力作用，并且具有 流动性 公式：P=ρgh
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好了，废话不多说
上图
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如下图，在质量不计、底面积相 等的甲、乙、丙三个容器中，装 入相同高度的同种液体
= = 液体对容器底部的压强P甲
P乙
P丙
= = 液体对容器底部的压力F甲
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练习一下（共4分钟） 选择正确的be动词
There _____ an apple on the table. 桌子上有一个苹果。
There _______ some water in the cup. 杯子里有一些水。
There _________ five apples on the table. 桌子上有五个苹果。
( ) 4. There _________ a big tree near my house last year.
A. is
B. are
C. was
D. were
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( ) 5. —Will there be a birthday party for you next week? —Yes, _________.
( ) 1. —What’s in your bedroom?
—There _________ a computer, two chairs and a bookshelf in my room.
A. are
B. be
C. has
D. is
( ) 2. __some toys and a book on the shelf.
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There be 就近原则
考点来了There be肯否疑问
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There be 是个近视眼
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就近原则
若句子中有几个并列主语时，be动词的形式要与离其最近的 一个主语在人称和数上保持一致。
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There be 是个近视眼
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there be和have的区别
There be 就近原则
考点来了 There be肯否疑问
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He has some money.
There is some money on the table.
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there be 表示存在，意为“某地/某时有……”经常与地点状语 或时间状语连用；
There_______ one boy and two girls in the classroom.
教室里有一个男孩和两个女孩。
There _________ two girls and one boy in the classroom.
教室里有两个女孩和一个男孩
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单选（4道）
F乙
F丙
＞ ＞ 容器对桌面的压强P甲
P乙
P丙
＞ ＞ 容器对桌面的压力F甲
F乙
F最丙新编辑ppt
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如下图，在质量不计、底面积相 等的甲、乙、丙三个容器中，装 入相同质量的液体
＜ ＜ 液体对容器底部的压强P甲
P乙
P丙
＜ ＜ 液体对容器底部的压力F甲
F乙
F丙
= = 容器对桌面的压强P甲
P乙
P丙
= = 容器对桌面的压力F甲
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There _____ a desk and fifty-five
chairs in the classroom.
A. areB. is源自最新编辑ppt20
There _____ fifty-five chairs
and a desk in the classroom.
A. are
B. is
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单选（7道）
( ) 1. There ___________ some books on the sofa.
A. has
B. is
C. have
( ) 2. —___________ children are there in the park?
—There are twelve children in the park.
5. She __________ some dresses.
6. They ___________ a nice garden.
7. What do you___________?
8. ______________a reading-room in the building?
9. What does Mike___________?
A. there is B. will
C. there be
D. there will
( ) 6. There ________ any food in the kitchen.
A. isn’t
B. is
C. are
D. aren’t
( ) 7. There __________two cups of tea on the table.