不同时态下被动语态的构成形式

被动语态是动词的一种特殊形式，一般来说，只有需要动作对象的及物动词才有被动语态。汉语往往用"被"、"受"、"给"等被动词来表示被动意义 。被动语态由“助动词be+及物动词的过去分词构成。被动语态的时态变化只改变be的形式，过去分词部分不变。疑问式和否定式的变化也如此。

1. 一般现在时的被动语态构成：is / am / are + 及物动词的过去分词 　　Our classroom is cleaned everyday.

2. 一般过去时的被动语态构成：was / were + 及物动词的过去分词 　　A new shop was built last year.

3. 现在完成时的被动语态构成：has / have + been + 及物动词的过去分词 　　This book has been translated into many languages.

4. 一般将来时的被动语态构成：will+ be + 及物动词的过去分词 　　　　Many more trees will be planted next year.

5. 含有情态动词的被动语态构成：情态动词+ be + 及物动词的过去分词 　　Young trees must be watered often.

6. 现在进行时的被动语态构成：am / is / are + being + 及物动词的过去分词 　　Uncle Wang is mending my bike now.→ 　　My bike is being repaired by Tom now.

7. 不定式的被动语态：to + be + 及物动词的过去分词 　　There are two books to be read. → 　　There are twenty more trees to be planted.