《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.?

... ... ...

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.

... ... ...

discover, invent和find都是動詞, 它們的詞義相近, 但是有區(qū)別:

★discover意為“發(fā)現(xiàn)”, 指發(fā)現(xiàn)某種本來存在,但以前未被發(fā)現(xiàn)或未為人所知的事物或現(xiàn)象。

The lost bike was discovered at the bus stop.?

丟了的自行車在公共汽車站那兒找到了。?

Later I discovered that he was so kind.

后來我才發(fā)現(xiàn)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? 你知道誰發(fā)明的電腦嗎？

★find 意為“找到, 發(fā)現(xiàn)”, 指偶然發(fā)現(xiàn)或幾乎沒有困難地發(fā)現(xiàn)。

I found some old photos in that drawer.我在那個抽屜里發(fā)現(xiàn)了一些舊照片。?

... ... ...

主動句變?yōu)楸粍泳渌裱?個步驟：

1. 把原主動句中的賓語變?yōu)楸粍泳涞闹髡Z。

2. 把動詞變?yōu)楸粍有问郊碽e+過去分詞，并注意其人稱和數(shù)隨主語的變化，而動詞的時態(tài)則保持不變。

3. 原主動句的主語如需要則放在by后面以它的賓格形式出現(xiàn)（注代詞的賓格），如不需要則可省略。

4. 其它的成分（定語、狀語）不變。

被動語態(tài)的運用:

（1） 不知道誰是動作的執(zhí)行者或沒有必要知道誰是動作的執(zhí)行者時。

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?

這條路什么時候通車?

（2） 需要強調(diào)動作的對象即賓語時。Calculator can't be used in the math exam.?

計算器不能用于數(shù)學考試。He was awarded first prize in that contest.?

他在比賽中獲得了第一。

... ... ...

關(guān)鍵詞：《When was it invented?》教學課件，人教版九年級上冊英語課件，九年級英語幻燈片課件下載，《When was it invented?》PPT課件下載，.ppt格式