31《动词的语态》 Passive Voice 被动语态 Lead in Rockets ________ (use) to send up satellites. are used 污染图 The air and the water _________ _______(pollute). are being polluted 砍伐图 Trees ___________(cut) down. Soil ____________ (wash) away. are being cut will be washed 拳击图 A boxer _____________(beat) down. has been beaten 双子楼图 The twin towers ___________ (attack) in 2001. were attacked 生病图 The boy may _______________ (infect) with AIDS. have been infected 表格:被动态基本结构 时态 被动语态结构 一般现在时 一般过去时 现在进行时 过去进行时 一般将来时 过去将来时 现在完成时 过去完成时 am/is/are done was/were done am/is/are being done was/were being done shall/will be done would be done have/has been done had been done Oral practice-主动句改被动句 Oral practice--1. Change each sentence into passive voice: A car knocked him down yesterday. Two doctors and ten nurses make up the medical team. When I got there, they were cutting up a fallen tree. He was knocked down by a car…. The medical team is made up of…. A fallen tree was being cut up….
