思馬得英語100個句子學(xué)英語語法（33）：各種結(jié)構(gòu)的被動形式

　　<例句>

　　How could he be persuaded to stay?

　　怎么能勸說他留下?

　　<語句分析>

　　由can, could和be可構(gòu)成被動結(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)成被動形式。有些成語動詞如及物動詞+副詞，動詞+介詞，動詞+副詞(名詞)+介詞等都可以有被動結(jié)構(gòu)形式。

　　<觸類旁通>

　　(1) This can't have been done by a human being.

　　這不可能是人做的事情。

　　語法分析：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。

　　語法分析：may, might可構(gòu)成被動結(jié)構(gòu)。

　　(3) They might have been put in the wrong place.

　　它們可能被放錯了地方。

　　語法分析：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。

　　語法分析：ought to 的被動結(jié)構(gòu)。

　　(5) When is the dam going to be completed?

　　水壩什么時候建成?

　　語法分析：be going to 構(gòu)成的被動結(jié)構(gòu)。

　　(6) Her illness was brought on by her worries.

　　她憂慮成疾。

　　語法分析：成語動詞的被動結(jié)構(gòu)。

　　(7) We were assigned a lot of homework.

　　我們有很多家庭作業(yè)。

　　語法分析：雙賓動詞的被動結(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