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
一般现在时的被动语态:助动词is/am/are+P.P.(过去分词)
TheOlympicGamesisheldonceeverfouryears.
一般过去时的被动语态:助动词was/were+P.P.
Thebridgewasbuiltin1995.
一般将来时的被动语态:助动词will+be+P.P.
Theteachingbuildingwillbeputupnextyear.
过去将来时的被动语态:助动词would+be+P.P.
现在进行时的被动语态;助动词is/am/are+being+P.P.
Anewfactoryisbeingbuiltinourtown.
现在完成时的被动语态:助动词have/has+been+P.P.
HehasbeensenttoworkinTibet.
情态动词的被动语态;情态动词+be+P.P.
Yourhomeworkmustbefinishedassoonaspossible.
TeenagershouldnotbeallowedwatchTVeverynight.
过去进行时的被动语态:助动词was/were+being+P.P.
WhenIgothome,dinnerwasbeingcookedbymother.