复合宾语的被动语态:原来的句子是“主语+谓语+宾语+宾语补足语”,在变被动语态的时候只
能将宾语变为被动语态的主语,宾语补足语变为被动语态的主语补足语。
例如:They heard her sing an English song at the party.
他们在晚会上听到她唱了一首英语歌。
变为被动语态是:She was heard to sing an English song at the party.
What about- They heard her singing an English song at the party.
add your reason