1 The mechanical energy could be changed into electrical energy by a generator.
2 A car accident happened on the highway this morning. the wounded was took away to the hospital by people immediately, and the policeman were sent by the goverment to cope with the event.
3 Two thirds of this area are covered by the forests of pine and fir.
被动最简单的方法是把宾语提前做主语 然后加be+动词的过去式。
比如 I hit him. 我打了他 i是主语 him是宾语 hit是动词
被动 he was hit by me
宾语提前 加be+动词过去式 was hit 原主语by me放最后。
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