几种重要的被动语态变化

1.带复合宾语的被动结构1) 在主动语态中make、let、see、hear、watch、notice等词,其后跟省略不定式符号to的动词不定式,在变为被动浯态时,必须还原动词不定式符号to。如: We saw Tom swim in the river yes-terday. →Tom was seen to swim in the riveryesterday. 2)在主动语态中以see、hear、watch