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被动语态的用法：
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.
