1.被動語態(tài)的構(gòu)成

由于不及物動詞不能帶賓語,故無被動語態(tài),只有及物動詞或相當(dāng)于及物動詞的動詞短語才有被動語態(tài),其基本構(gòu)成方式是“助動詞be+過去分詞”。

注意:“be+過去分詞”結(jié)構(gòu)不一定都是被動語態(tài),有些動詞(如 be,feel,look,seem等)后面的過去分詞已轉(zhuǎn)化為形容詞,用作表語表示狀態(tài)。如:

My bike is broken.(我的自行車壞了。)

The door is open.(門開了。)

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2.主動語態(tài)改被動語態(tài)的方法

1)將主動語態(tài)改為被動語態(tài)應(yīng)注意以下三個方面:①將主動語態(tài)的賓語改為被動語態(tài)的主語;②將主動語態(tài)的謂語動詞改為“be+過去分詞”結(jié)構(gòu);③將主動語態(tài)的主語改為介詞by之后的賓語,放在謂語動詞之后(有時可省略)。

2)含直接賓語和間接賓語的主動語態(tài)改為被動語態(tài)時有兩種情況:①把間接賓語改為被動語態(tài)的主語,直接賓語仍保留原位;②把直接賓語改為主動語態(tài)的主語,此時,間接賓語前要加介詞to或 for。如:

He gave the boy an apple.→ The boy was given an apple.(或An apple was given to the boy.)

Her father bought her a present.→ She was bought a present by her father.(或A present was bought for her by her father.)

3)不帶to的動詞不定式作賓語補(bǔ)足語的主動語態(tài),改為被動語態(tài)時不定式前要加to。如:

They watched the children sing that morning.→ The children were watched to sing that morning.

4)帶復(fù)合賓語的動詞在改為被動語態(tài)時,一般把主動語態(tài)的賓語改為主語,賓語補(bǔ)足語在被動語態(tài)中作主語補(bǔ)足語。如:

We call him Xiao Wang.→ He is called Xiao Wang.

He cut his hair short.→ His hair was cut short.

They told him to help me.→ He was told to help me.

5)短語動詞是不可分割的整體,改為被動語態(tài)時要保持其完整性,介詞或副詞不可遺漏。如:

We must take good care of the young trees.→The young trees must be taken good care of.

6)含有賓語從句的主動結(jié)構(gòu)變?yōu)楸粍咏Y(jié)構(gòu)時,通常用it作為被動結(jié)構(gòu)的先行主語,從句放在句子后面;也可采用另一種形式。可以這樣轉(zhuǎn)換為被動結(jié)構(gòu)的動詞有know,say,believe,find,think,report等。如:

People believe that he is ill.→It is believed that he is ill.(或:He is believed to be ill.)

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3.被動語態(tài)改為主動語態(tài)的方法:

被動語態(tài)中介詞by后的賓語改為主動語態(tài)中的主語(或按題意要求確定主語),按照這個主語的人稱和數(shù)以及原來的時態(tài)把謂語動詞形式由被動語態(tài)改為主動語態(tài)。注意在主動語態(tài)中有的動詞要求不帶to的動詞不定式作賓語補(bǔ)足語,此時要把被動語態(tài)中的to去掉。被動語態(tài)的主語用來作主動語態(tài)的賓語。如:

History is made by the people.→ The people make history.