passive verbs的用法和樣例：
例句
- Change these sentences into the Present Perfect Passive, putting the verbs into the correct forms.
用動(dòng)詞的正確形式將下面的句子變成現在完成時(shí)的被動(dòng)語(yǔ)態(tài)。 - Students say out the three forms of some regular and irregular verbs by giving the infinitives.
引入競爭機制，說(shuō)出規則與不規則動(dòng)詞的三種形式，鞏固被動(dòng)語(yǔ)態(tài)中過(guò)去分詞的正確使用。
