Wildlife protection(二)
主讲教师：麻雪玲 北京市英语教师
本讲目标
被动语态
被动结构:be +v-ed
现在进行时：am/is/are+done
过去进行时：was/were +done
被动语态难点
一. 无被动的词: 不及物动词、感官动词：happen, take place, break out, belong to …
三. done, being done, to be done, having been done 表被动，非谓语
四. 动词短语变被动，打包都变。 ta ke care of—be taken care of
以主代被
1. 表示物质固有特性时，以主代被。This kind of material cuts easily.
2. Need/want/require+doing 需要/想要被……The flowers need watering = to be wat ered.
3. Be worth doing This book is worth reading.
4. 修饰名词的不定式与句中另一名词或者代词也是主谓关系时。
I have a letter to be posted.
