题目内容：

英语的八种时态及被动语态

优质解答

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.I am asked to study hard.Knives are used for cutting things.2.一般过去时的被动语态构成：w...