被动语态的基本用法一. 何时使用被动语态 1. 不知道谁是动作的执行者或没有必要 如：Paper is made from wood. The house is quite old. It was built in 1950. He was wounded in the fight. 2. 需要强调动作的承受者时 如：Calwlator can't be used in the maths exam. Books and newspapers in the reading room mustn't be taken away. He was awarded first prize in that contest. 3 为了使语气婉转，避免提及自己或对方而使用被动语态，或由于修饰的需要，使用被动语态，使句子得以更好的安排。 如：The construction of the new lab must be completed by the end of next month. Electricity is used to run machines. 二. 被动语态的构成 1. be+done 可以是被动语态，也可以是系表结构形式。被动语态中，done 可以带 by 短语，而系表结构中 done 相当于 adj. 不带 by 短语。 如：The question is settled. (系表结构) Such questions are settled by us. (被动语态) The composition is well written. (系表结构) The composition is written with great care . (被动语态) The job was well done. (系表结构) The job was well done by a skilled worker. (被动语态) 2. 许多 verbs(broken, interested, shut, worried), 既可以用做 adj.也可以在被动语态结构中做过去分词。句中如果有 by，通常是被动语态。 如：I was worried about you all night. (表状态) I was worried by mosquitoes all night. (表动作) The glass was broken by Jack. (表动作) The glass is broken. (表状态) I was frightened by his ghost story. She was frightened at the sight of a snake. 三. 不同形式的被动语态 1. 含有直宾和间宾的主动结构，变为被动时，可将其中一个宾语变为主语，另一个不动一般是主语结构的间接宾语变为被动的主语。 如：He showed me his pictures. I was shown his pictures by him. His pictures were shown to me by him. Aunt made me a new dress. I was made a new dress by aunt. A new dress was made for me by aunt. He sent me a birthday present. I was ...
