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3)使用被動語態可以避免說出別扭的句子。
如：When he arrived home a detective arrested him.他回到家時，一名偵探逮捕了他。(主動)
此句最好表示為：
When he arrived home he was arrested by a detective.他回到家里就被一名偵探逮捕了。(被動)變為被動后，可以避免改換主語。
4) 主動句中主語是不定代詞one，通常可以表示為被動語態。
如：One sees this sort of advertisement everywhere.這樣的廣告到處可見。(主動)
This sort of advertisement is seen everywhere. 這樣的廣告到處可見。(被動)
5)當動作的實施者即主動句中的主語是泛指人們時：這樣的動詞有：assume, believe, claim, consider, estimate, find, know, report, say, think等，通常可以表示為被動語態。
如：People believe him to be honest.人們相信他是誠實的。
He is believed to be honest.相信他是誠實的。
6)新聞報道，書刊介紹等文體中，突出描述的客觀性。
如：Three people have so far been killed in the storms sweeping across the north of England and Southern Scotland.在席卷英格蘭北部和蘇格蘭南部的暴風雨中，三人喪生。
4.被動語態與系表結構的區別：
英語中有些“be+過去分詞”的形式可以表示被動語態也可以作系表結構。如果表示一個動作，則是被動語態;如果表示狀態，則是系表結構。表示被動時，常伴有by短語;表示狀態時多用其他介詞短語(in, at, with等)
如：The novel is well written.這個小說寫得很好。(系表結構)
The novel is written by a woman.這個小說是一位婦女寫的。(被動)
The man was offended. 那個人很生氣。(系表結構)
The man was offended by the woman.那個男人被那個女人激怒了。(被動)
5.主動形式表被動含義：
當句子中出現easy , hard , difficult 等詞修飾時，我們用主動形式表達被動
如 I found the poem hard to understand .
2001年第25小題：
They found the lecture hard --------
A to be understood B to understand C for understanding D to have been understood
答案是B
第二部分：鞏固練習
把下列句子變為被動句：
1.He suggested using the waterproof material.
He suggested that the waterproof material should be used.
2. He advised us to go to school earlier.
We are advised to go to school earlier.
3.The waiter recommended us to order the seafood.
We were recommended to order the seafood.
The waiter recommended that the seafood should be ordered.
4.We often hear him sing in the next room.
He is often heard to sing in the next room.
5.You needn't return the book now.
The book needn't be returned now.
6. They will send you a bill at the end of the month.
You will be sent a bill at the end of the month.
A bill will be sent to you at the end of the month.
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