摘要：被动语态表示句子的主语是动作的承受者.也就是动作的对象.一般说来只有及物动词才有被动语态.其构成为"be+及物动词的过去分词".助动词be有人称.数和时态的变化.其变化规则与be作为连系动词时完全一样.含有情态动词的谓语变化为被动语态时.由"情态动词(can, may must, have to等)+be +动词的-ed形式.含有"be going to , be to, used to, be about to"等结构的复合谓语变为被动语态时.其构成为"be going to (be to, used to, be about to)+ be +动词的-ed形式"构成.1.被动语态的适用范围 ①当我们不知道谁是动作的执行者.或者没有必要指出谁是动作的执行者时.这时不用by短语. This jacket is made of cotton. 这件上衣是棉料的. ②为了强调动作的承受者时 Visitors are requested not to touch the exhibits. 要求参观者不可触摸展品. ③出于策略.委婉.礼貌等不提出动作的执行者 You are said to be active recently. 据说你最近很活跃. 常用于如下句型: It's not known that- --不得而知 It's said that- 据说-- It's reported that- 据报道-- It's not decided that-尚未决定 It's believed that- 据认为-- It's announced that-据宣布--

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