《When was it invented?》PPT課件16
Here is a big box .Fisher(費希爾）invented it in 1901. It’s very hard-working. It can make your clothes clean and your housework easy. With its help you can have more time to relax or to work.
What’s it used for?
It is used for washing things.
Who was it invented by?
It was invented by Fisher
When was it invented?
It was invented in 1901.
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What invention are they talking about?
The zipper.
Who invented the zipper?
It was invented by Whitcomb Judson.
When was the zipper invented?
In 1893.
When was it used widely?
In 1917.
Where can you see zippers?
On dresses, trousers, shoes, bags,… almost everywhere.
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discover, invent和find都是動(dòng)詞, 它們的詞義相近, 但是有區別:
★discover意為“發(fā)現”, 指發(fā)現某種本來(lái)存在,但以前未被發(fā)現或未為人所知的事物或現象。
The lost bike was discovered at the bus stop.
丟了的自行車(chē)在公共汽車(chē)站那兒找到了。
Later I discovered that he was so kind.
后來(lái)我才發(fā)現他那么善良。
★invent 意為“發(fā)明”, 指發(fā)明以前不存在的東西。
Do you know who invented the computer? 你知道誰(shuí)發(fā)明的電腦嗎？
★find 意為“找到, 發(fā)現”, 指偶然發(fā)現或幾乎沒(méi)有困難地發(fā)現。
I found some old photos in that drawer.我在那個(gè)抽屜里發(fā)現了一些舊照片。
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主動(dòng)句變?yōu)楸粍?dòng)句所遵循的4個(gè)步驟：
1. 把原主動(dòng)句中的賓語(yǔ)變?yōu)楸粍?dòng)句的主語(yǔ)。
2. 把動(dòng)詞變?yōu)楸粍?dòng)形式即be+過(guò)去分詞，并注意其人稱(chēng)和數隨主語(yǔ)的變化，而動(dòng)詞的時(shí)態(tài)則保持不變。
3. 原主動(dòng)句的主語(yǔ)如需要則放在by后面以它的賓格形式出現（注代詞的賓格），如不需要則可省略。
4. 其它的成分（定語(yǔ)、狀語(yǔ)）不變。
被動(dòng)語(yǔ)態(tài)的運用:
（1） 不知道誰(shuí)是動(dòng)作的執行者或沒(méi)有必要知道誰(shuí)是動(dòng)作的執行者時(shí)。
The house is quite old. It was built in 1950.
這座房子太舊了，它是1950年建的. When will the road be opened to traffic?
這條路什么時(shí)候通車(chē)?
（2） 需要強調動(dòng)作的對象即賓語(yǔ)時(shí)。Calculator can't be used in the math exam.
計算器不能用于數學(xué)考試。He was awarded first prize in that contest.
他在比賽中獲得了第一。
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關(guān)鍵詞：《When was it invented?》教學(xué)課件，人教版九年級上冊英語(yǔ)課件，九年級英語(yǔ)幻燈片課件下載，《When was it invented?》PPT課件下載，.ppt格式
