passive verbs

• 被动动词

passive verbs的用法和样例：

例句

1. Change these sentences into the Present Perfect Passive, putting the verbs into the correct forms.
   用动词的正确形式将下面的句子变成现在完成时的被动语态。
2. Students say out the three forms of some regular and irregular verbs by giving the infinitives.
   引入竞争机制，说出规则与不规则动词的三种形式，巩固被动语态中过去分词的正确使用。