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2) They built a new bridge over the river. (Active voice)
A new bridge was built over the river. (Passive voice)
We use the active voice when it is important to know who performs the action.
We can also use the passive voice when：
1. It is obvious who performs the action.
Word processing skills are taught in our computer lessons.
2. We do not know or do not want to know who performed the action.
The printer was sold already.
3.We think the action is more important than the person who performs the action.
Educational CD-ROM are sold in many countries.
We can also introduce the person who performs an action with the passive voice using ‘by’. We put ‘by’ and the name(s) of the person(s) at the end of a passive sentence.
（活动方式:独立思考—小组讨论—小组展示—小组总结）
探究活动二：Passive voice with ‘by’
1.Explain that we can also use the passive voice when we want to mention the doer( 实行者) or agent who does something. Introduce the concept of ‘by’ which enables us to say the name of the doer. We can use ‘by’ to say who or what does the action.
2.Read through the sample sentences on page 49 and make them understand how to use ‘by’.
3.Tell the students to complete ‘Work out the rule!’ on their own.
（活动方式:小组讨论—小组汇报）
探究活动三：Do the exercises
1 Complete the sentences in Part A on page 99, then check the answers in groups
2 Complete the conversation in Part B using the passive voice.
3 Change the active voice into the passive voice.
1). We clean the classroom every day.
_______________________________________
2). He waters flowers twice a week.
_______________________________________
4 Draw the conclusion
We use ‘am’, ‘is’, ‘are’ + past participle to form the passive voice in the simple present tense.
We use ‘was’, ‘were’ + past participle to form the passive voice in the simple past tense.
（活动方式:独立思考—小组讨论—小组展示）
三、归纳总结