这些句子怎么改成被动句
所谓改成被动语态的意思就是让句子中原来充当宾语的成分提出来做主语，然后把原来的谓语动词改成被动形式，即在原来动词前加相应的be动词，然后动词改成过去分词形式。
例如：主动语态：We（主） plant（谓） many trees（宾） along the road.
被动语态：Many trees（主，原句中的宾） are planted（谓，be+过去分词） along the road (by us（原句中的主，有时可以省略）).
一般来时主动改被动时原来句中的主语，即动作的发出者就可以省略了。
主动语态→被动语态：
1、找到该句宾语（必须是在谓语动词后的）,将它提到句子开头。
2、用被动语态结构be+Vt过去分词构成句子。
3、把原句的主语用by构成的介词短语带出，也可不加。
I finished my homework yesterday.
→My homework was finished (by me) yesterday.
新兴形式
Get+过去分词也可以构成被动语态，用这种结构的句子侧重于动作的结果而不是动作本身。如： The man got hurt on his way home. 那个男人在回家的路上受伤了。
How did the glass get broken? 杯子怎么破了？
周海中教授在论文《Get-Passive研究》中指出：Get+过去分词的被动语态是一种新兴的被动语态形式；相对来说它的使用还没有Be+过去分词构成的被动语态那么广泛，一般限于口语和非正式书面语；但它却有着用得愈来愈多的趋势，是一种生气蓬勃的语言现象。
A new pen _was__ _given__ _to__ tom last week.
2 A lot of people in China can spcak English now.
English _can _be__ _spoken__ by a lot of people China now.
3 I have learned English for about two years.
English _has__ _been__ _learned__ for about two years.
4 they will publish these story-books next month
These story-books __will_ _be__ _published__ next month.
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