编者按：在英语学习中，句型转换是考查你是否已经真正掌握语法知识的重要方法。你知道英语中如何将主动语态改为被动语态吗?下面小编分享了主动句和被动句之间的转换方法，快点学起来吧!
主动语态改被动语态的方法
一.三步骤
1.把主动语态的宾语变成被动语态的主语。
2.把主动语态的谓语变成被动语态的“be+过去分词”结构;时态要与原句保持一致。
3.将主动语态的主语改为介词by之后的宾语，放在谓语动词之后(有时可省略)。如果原句主语是地点名词，在被动语态中用in + 地点名词作状语。
二.含直接宾语和间接宾语的主动语态改为被动语态时有两种情况：
1. 把间接宾语改为被动语态的主语，直接宾语仍保留原位;
He gave the boy anapple.
→The boy was givenan apple.
2. 把直接宾语改为主动语态的主语，此时，间接宾语前要加介词to或for。
He gave the boy anapple.
→An apple wasgiven to the boy.
Her father bought hera present.
→ A present wasbought for her by her father.
(注：一般在下列动词后，常在间接宾语前用介词 to，如：
bring, give, hand, lend, offer, pass, pay, promise, sell, show, take, teach, tell 等。
下列动词后，间接宾语前用介词 for, 如：
build, buy, cook, cut, choose, do, fetch, find, fix, get, keep, make, order, paint, play, sing 等。)
三. 带复合宾语(宾语+ 宾补)的动词改为被动语态时，一般把主动结构中的宾语改为主语，而宾语补足语保留在谓语动词后面。
We call him Xiao Wang.
→He is called XiaoWang.
He cut his hair short.
→His hair was cutshort.
They told him to helpme.
四.see, watch, hear, notice, listen to, look at, make, feel等动词后作宾语补足语的动词不定式都不带 to，但改成被动语态后都带to。
We often hear him play the guitar.
→He is often heard to play the guitar.
They watched thechildren sing that morning.
→The children werewatched to sing that morning
作者|Sunny
公众号：初中英语语法知识点同步讲解
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