来源：学生作业帮 编辑：拍题作业网作业帮 分类：英语作业 时间：2024/06/10 17:44:50
把一个句子改为被动句,
we heard betty sing a song just now.(改为被动句）.
betty ____ ____ ____ ____ a song just now by us.
嗯,然后,希望给出正确答案,并说明怎么做出来的,希望讲解仔细.
Betty was heard to sing a song just now by us.
Betty唱歌是已经被我们听见的,所以用过去时态
hear是感官动词,在变成被动语态时,要还原to
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