被动语态基本概念语态表示主语和谓语的关系。语态有两种：主动语态和被动语态。如果主语是动作的执行者，或者是说动作是由主语完成的，要用主动语态，如：We speak Chinese in China.在中国我们说汉语；如果主语是动作的承受者，或者是说动作不是由主语而是由其他人完成的，则用被动语态，如：Chinese is spoken by us in China.在中国汉语被我们说。基本结构被动语态由“be（助动词） +done( 过去分词）”构成，句中人称、数和时态是通过be来表现的。be（助动词）随着时态以及主语的人称和单复数而变化。见的几种时态的被动语态如下（以动词do为例）：一般现在时态 am / is / are + doneAn apple is eaten by me every day. （一个苹果每天都被我吃掉。）一般过去时态 was / were + doneHe was taken to the park by his mother yesterday. （昨天，他被妈妈带去了公园。）一般将来时态 will be + doneThe child will be sent to his parents next week. （ 那个小孩子下个月将要被送回他的父母那里。）现在完成时态 have / has been + doneMy homework has been finished by me. （我的已经被做完了。）现在进行时态 am / is / are being + doneA big bridge is being built in our city now. （一座大桥正在我们的城市被建造。）含有情态动词 情态动词 + be + done Trees can be planted at the foot of the hill. （树可以被种在山脚下。）被动语态的用法(1)不知道或没有必要说明动作的执行者是谁.例如：Some new computers were stolen last night.一些新电脑在昨晚被盗了.(不知道电脑是谁偷的)This book was published in 1981.这本书出版1981年.(2)强调动作的承受者,而不强调动作的执行者.例如：the window was broken by Mi |
