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

　　Ourclassroomiscleanedeveryday.

　　Iamaskedtostudyhardbymymother.

　　Knivesareusedforcuttingthings.

　　2.一般过去时的被动语态构成：was/were+及物动词的过去分词

　　Anewshopwasbuiltlastyear.

　　Dinosaureggswerelaidlonglongago.

　　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

　　Thisbookhasbeentranslatedintomanylanguages.

　　Manyman-madesatelliteshavebeensentupintospacebymanycountries.

　　4.一般将来时的被动语态构成：will+be+及物动词的过去分词

　　Anewhospitalwillbebuiltinourcity.

　　Manymoretreeswillbeplantednextyear.

　　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

　　Youngtreesmustbewateredoften.

　　Yourmistakesshouldbecorrectedrightnow.

　　Thedoormaybelockedinside.

　　Yourhomeworkcanbehandedintomorrow.

　　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

　　UncleWangismendingmybikenow.→

　　MybikeisbeingrepairedbyTomnow.

　　Theyareplantingtreesoverthere.→

　　Treesarebeingplantedovertherebythem.

　　7.不定式的被动语态：to+be+及物动词的过去分词

　　Therearetwobookstoberead.→

　　Therearetwentymoretreestobeplanted.