外研版高中英語(yǔ)必修三《The world of science》PPT下載(第2課時(shí))，共12頁(yè)。
現(xiàn)在完成時(shí)的被動(dòng)語(yǔ)態(tài)的用法
1．表示被動(dòng)的動(dòng)作在說(shuō)話之前已經(jīng)完成，強(qiáng)調(diào)過(guò)去的動(dòng)作對(duì)現(xiàn)在造成的影響或產(chǎn)生的結(jié)果，通常與already，yet，never，recently等副詞及時(shí)間狀語(yǔ)so far，by now，up till/to now，since等連用。
The databasehas already been updated.
數(shù)據(jù)庫(kù)已經(jīng)被更新了。(現(xiàn)在可以使用新的數(shù)據(jù)庫(kù)了)
2．表示一個(gè)被動(dòng)的動(dòng)作或狀態(tài)從過(guò)去開始一直持續(xù)到現(xiàn)在，并可能繼續(xù)持續(xù)下去，常與for或since等引出的時(shí)間狀語(yǔ)(從句)連用，或用于howlong引出的句子中。
The machine has been repaired for two hours.
這臺(tái)機(jī)器已經(jīng)被修了兩個(gè)小時(shí)了。(可能還會(huì)繼續(xù)被修)
3．用在條件狀語(yǔ)從句中，表示將來(lái)某時(shí)已經(jīng)完成的動(dòng)作。
You shouldn’t leave school beforeyour homework has been finished.
在你的作業(yè)沒(méi)完成之前你不應(yīng)該離開學(xué)校。
Practice
Rewrite the underlined sentences in the passage using the present perfect passive.
① It has already affected many things in our lives.
② Some restaurants in London have served 3D-printed hamburgers to customers.
③ The most significance success that people have achieved to date is in medicine.
④ They have made human body parts, including a beating heart, with 3D printing technology.
⑤ People have given a new 3D-printed shell to a turtle injured in a forest fire.
Homework
Rewrite the following sentences with the present perfevt passive.
1. You can see that they have not painted thehouse for years.
2.It is said that two thieves have broken intothe house .
3. Have people criticized his views ?
4. He has not taken away the two books.
5. Where have you repaired the mobile phone?
6. The company has brought down the price ofthe colour TV set again .
7. My parents gave me a toy at Christmas.
8. Someone saw a stranger walk into thebuilding.
9. They saw the boy smoking a cigarette.
10. The boss forced the workers to work day andnight.
... ... ...
關(guān)鍵詞：The world of science PPT課件免費(fèi)下載，.PPT格式；
