英语中及物动词有两种语态,即主动语态和被动语态.主动语态表示主语是动作的执行者被动语态表示主语是动作的承受者.被动语态由“助动词be+及物动词的过去分词”构成.助动词be有人称、时态和数的变化.一、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：was / were + 及物动词的过去分词 A new shop was built last year.Dinosaur eggs were laid long long ago.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.Many man-made satellites have been sent up into space by many countries.4.一般将来时的被动语态构成：will+ be + 及物动词的过去分词 A new hospital will be built in our city.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.Your mistakes should be corrected right now.The door may be locked inside.Your homework can be handed in tomorrow.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.They are planting trees over there.→ Trees are being planted over there by them.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 追问：动词的 过去分词 呢 追问：
最新问答： She has a new hat for ¥30.She buys a yellow bag at¥ 显性基因和隐性基因列举一些隐性基因和显性基因（例如双眼皮是显性基因,单眼皮是隐性基因）.越多越好 以下四个命题：①PA、PB是平面α的两条长度相等的斜线段，则它们在平面α内的射影的长度必相等；②平面α内的两直线l 1 cos²（π/4-α）+cos²π/4+α）=? 论述鲁迅现代诗歌的内容,并举例说明. 父亲节日快乐用英语怎么说 阅读下面短文按要求答题 陈太丘与友期行,期日中,过中不至,太丘舍去,去后乃至.元方时年七岁,门外戏.客问元方：“尊君在不 英语阅读题Jack London was a famous American writer ,He was born o 苯酐吡啶溶液为什么变黄我配制的苯酐酰化剂为什么变黄.刚配比的时候是透明无色的放置一天就变黄.而且随着时间的推迟黄度加重有 各位大哥大姐 i'm wing chun master来看看，这句有没有语法错误各位大 什么是气动调节阀的公称压力 We should make a decision that could mean decide 在0-45°范围内化简根号(1-2sinAcosA) 先用然字组四个词在前下列句的括号里 绝对值等于8的数是什么 在平面直角坐标系XOY 中，y＝x²－6x＋1与坐标轴的交点都在圆C上。求圆C的方程 按一定的规律排列的一列数依次为：[1/2，13，110，115，126，135]…，按此规律排列下去，这列数中的第7个数 M和S到底是什么意思 语文句子的划分:什么可以充当宾语 初二的题目.已知氢气在氧气中燃烧产生水,先有20克氢气和氧气的混合物,点燃后反应生成18克水,求混合物气体中氧气的质量
