其实楼主要注意的地方应该是，变被动为主动时的情况，此时与一般不同，要自己加上主语！一般题目是没有给出人名之类的东西的，因为命题人认为学生在平时的练习里是有做过的，所以就没有给出，这个也是用于考试时判断学生是否作弊的根据啦，楼主觉得如何？！呵……参考答案如下：
1.the car was hidden in thre trees.
主动句（加上主语哦！）：Ken hid his car in the trees.
2.the sheep were herded into a pen.
主动句：The herds-man(牧羊人) herded the sheep into a pen.
3.the teacher made us stay late.
被动句：We were made to stay late.
4.the arrow were all fired into the bull's eye.
主动句：The hunter fired all the arrow into the bull's eye.
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