Unit7ThePassiveVoice课件
日期：2010-02-06 02:06
助动词be+动词的过去分词
1一般现在时 am/is/are+V(pp)
People use electricity to run machines?
Electricity is used to run machines
2一般过去时 was/were + V(pp)
We planted many trees on the hill yesterday
Many trees were planted on the hill yesterday
3一般将，
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