人教版九年級(jí)英語(yǔ)上冊(cè)《When was it invented?》SectionB PPT課件下載(第1課時(shí))，共27頁(yè)。
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?
拓展閱讀
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 (大塊) of meat between two slices of bread, so that he could carry on gambling without stopping to eat.
Language Points
1.by mistake為介詞短語(yǔ)，意為“無(wú)意中；錯(cuò)誤地”,相當(dāng)于accidentally。
例句：
►I missed the school bus by mistake this morning.
今天早上我無(wú)意中錯(cuò)過(guò)了校車。
►I took your pen by mistake. 我錯(cuò)拿了你的鋼筆。
【拓展】
mistake還可以構(gòu)成短語(yǔ)：
make a mistake/make mistakes犯錯(cuò)誤；
mistake…for… 把……錯(cuò)認(rèn)成……。例句：
►Don’t make mistakes any more. 別再出錯(cuò)了。
►I mistook her for our English teacher.
我把她錯(cuò)認(rèn)成我們的英語(yǔ)老師了。
2.The customer thought the potatoes were not thin enough. 顧客認(rèn)為土豆不夠薄。
enough修飾名詞時(shí)，不需要倒裝。
如: 我有足夠的錢。
餐廳里的食物不太夠。
►There isn’t enough food in the dinning hall.
其修飾形容詞、副詞要倒裝。
►He wrote carefully enough to get the award of the competition.
enough常可以和詞組so...that，too...to轉(zhuǎn)換。
如：他跑得不夠快，趕不上其他人了。
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.
顧客最終高興了。
(1) in the end 后來(lái)，最后，終于
at the end of ... 在……末
by the end of ... 到……末為止
如：①這個(gè)月月末我們將會(huì)開個(gè)會(huì)。
►At the end of this month we’ll have a meeting.
②到去年末為止我們已經(jīng)做了十架飛機(jī)了。
►By the end of last year we’ve made ten planes.
(2) in the end 用一個(gè)單詞表達(dá)可以是finally，
用一個(gè)短語(yǔ)表達(dá)可以用at last 。
如：最后他贏了。
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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