《When was it invented?》SectionB PPT课件下载(第1课时)

人教版九年级英语上册《When was it invented?》SectionB PPT课件下载(第1课时)，共27页。

Objectives

To learn how potato chips were invented.

To learn to listen for the details.

To talk about the history of inventions.

What kind of snacks do you like to eat?

How do they tastes?

Can you describe them?

Which taste do you like best?

拓展阅读

It is said the sandwich was invented in England in the 18th century by John Montagu, 4th Earl of Sandwich. 

He asked his servants to prepare a chunk (大块) of meat between two slices of bread, so that he could carry on gambling without stopping to eat. 

Language Points

1.by mistake为介词短语，意为“无意中；错误地”,相当于accidentally。

例句：

►I missed the school bus by mistake this morning. 

今天早上我无意中错过了校车。

►I took your pen by mistake. 我错拿了你的钢笔。

【拓展】

mistake还可以构成短语：

make a mistake/make mistakes犯错误；

mistake…for… 把……错认成……。例句：

►Don’t make mistakes any more. 别再出错了。

►I mistook her for our English teacher. 

我把她错认成我们的英语老师了。

2.The customer thought the potatoes were not thin enough.  顾客认为土豆不够薄。

enough修饰名词时，不需要倒装。

如: 我有足够的钱。 

餐厅里的食物不太够。

►There isn’t enough food in the dinning hall.

其修饰形容词、副词要倒装。

►He wrote carefully enough to get the award of the competition.

enough常可以和词组so…that，too…to转换。

如：他跑得不够快，赶不上其他人了。

用enough

►He didn’t run fast enough to catch up with the others.

用so…that

►He ran so slowly that he couldn’t catch up with the others.

用too…to

►He ran too slowly to catch up with the others.

3.The customer was happy in the end.   

顾客最终高兴了。

(1) in the end 后来，最后，终于

at the end of … 在……末

by the end of … 到……末为止

如：①这个月月末我们将会开个会。

►At the end of this month we’ll have a meeting.

②到去年末为止我们已经做了十架飞机了。

►By the end of last year we’ve made ten planes.

(2) in the end 用一个单词表达可以是finally，

用一个短语表达可以用at last 。

如：最后他赢了。

He won in the end. 

He won finally.  

He won at last. 

Homework

Listen to 1b.

Make conversations with other students talking about how potato chips were invented after class.

Write a conversation to talk about something else.

… … …

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