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
Ourclassroomiscleanedeveryday.
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.
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.
4.一般将来时的被动语态构成：will+be+及物动词的过去分词
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.
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.
7.不定式的被动语态：to+be+及物动词的过去分词
Therearetwobookstoberead.→Therearetwentymoretreestobeplanted.