各結(jié)構(gòu)的被動(dòng)形式
　　<例句>
　　How could he be persuaded to stay?
　　怎么能勸說(shuō)他留下?
　　<語(yǔ)句分析>
　　由can, could和be可構(gòu)成被動(dòng)結(jié)構(gòu)，can, could 后的不定式可用完成形式，may，might或should等詞后的不定式也可用完成形式。有一些不定式結(jié)構(gòu)如ought to, be going to等也可構(gòu)成被動(dòng)形式。有些成語(yǔ)動(dòng)詞如及物動(dòng)詞+副詞，動(dòng)詞+介詞，動(dòng)詞+副詞(名詞)+介詞等都可以有被動(dòng)結(jié)構(gòu)形式。
　　<觸類(lèi)旁通>
　　(1) This can't have been done by a human being.
　　這不可能是人做的事情。
　　語(yǔ)法分析：can, could后的不定式可用完成形式。
　　(2) The road may be further widened.
　　這條路還可再拓寬一點(diǎn)。
　　語(yǔ)法分析：may, might可構(gòu)成被動(dòng)結(jié)構(gòu)。
　　(3) They might have been put in the wrong place.
　　它們可能被放錯(cuò)了地方。
　　語(yǔ)法分析：may, might后的不定式也可用完成形式。
　　(4) This ought to be done right away.
　　這事情應(yīng)當(dāng)馬上去做。
　　語(yǔ)法分析：ought to 的被動(dòng)結(jié)構(gòu)。
　　(5) When is the dam going to be completed?
　　水壩什么時(shí)候建成?
　　語(yǔ)法分析：be going to 構(gòu)成的被動(dòng)結(jié)構(gòu)。
　　(6) Her illness was brought on by her worries.
　　她憂(yōu)慮成疾。
　　語(yǔ)法分析：成語(yǔ)動(dòng)詞的被動(dòng)結(jié)構(gòu)。
　　(7) We were assigned a lot of homework.
　　我們有很多家庭作業(yè)。
　　語(yǔ)法分析：雙賓動(dòng)詞的被動(dòng)結(jié)構(gòu)。
　　<鞏固練習(xí)>
　　(1) This can't _____ done in a short time.
　　(2) She might _____ sent to work abroad.
　　(3) All these factors mustn't _____ neglected.
　　(4) This should _____ kept a secret.
　　(5) Does this need _____[be] mentioned?
　　(6) How many people are going to _____[send] there?
　　(7) This has to _____[do] promptly.
　　(8) Not a soul was _____[see].
　　(9) You are requested _____[present] at the ceremony.
　　<參考答案>
　　(1) be (2) be (3) be (4) be (5) to be (6) be sent (7) be done (8) to be seen (9) to be present

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