约2290字。
　　Unit 4 Wildlife Protection
　　Grammar and Useful Structures
　　1st Period
　　1. Teaching aims
　　Let students get used to Passive Voice in different tenses
　　2. Teaching difficult point
　　How to help students master the usages of passive voice in different tenses
　　3. Procedure
　　Step 1. Greeting
　　Step 2. Daily Report
　　Step 3.
　　Introduce Passive Voice
　　语语法：被动语态
　　一、主动语态与被动语态的概念：
　　英语动词的语态有两种：⑴主动语态：表示主语是动作的执行者
　　⑵被动语态：表示主语是动作的承受者(常常没在有必要指出动作的执行者情况下使用)
　　例：They speak English. （主动语态）
　　主谓宾
　　English is spoken by them. （被动语态）
　　主谓介词短语
　　注：☆及物动词有被动语态，不及物动词必须带有介词才可以有被动语态。
　　例：⑴We listen to the teacher carefully in class.
　　主谓宾
　　→The teacher is listened to by us carefully in class.
　　主　谓　介词短语
　　⑵Ｗe laughed at him .
　　→He was laughed at by us.
　　二、被动语态的结构与用法：
　　㈠结构：be +done (过去分词)
　　被动语态中的be为助动词，无意义。be可能是am , is , are也可能是was ,were或原形be。
　　注：☆被动语态的时态是由be的时态决定的，be是什么时态，全句就是什么时态，be后面的过去分词不变。
　　㈡用法：
　　例：①Ｈistory is made by the people. (一般现在时)
　　②Ｔhe cars were made in Tianjing in 1995. (一般过去时)
　　③The tree will be cut down next year.(一般将来时)
　　④Ｔhe room must be kept clean.　（含有情态动词的被动语态）
　　⑤The door is being opened.　（现在进行时）
　　⑥The film has been seen by me.　（现在完成时）　
　　三、被动语态的各种句型：
　　１、Ｔhe song is liked by young people. (肯定句)
　　２、Ｔhe song isn’t liked by young people　　（否定句）
　　３、Is the song liked by young people ?　　　（一般疑问句）
　　４、Who is the song liked by ?=By whom is the song liked?