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被动被动语态的用法
1. 一般现在时的被动被动语态构成: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.