do you sweep the floor every day?改为被动语态 _____ the floor ____ every day?

问题描述:

do you sweep the floor every day?改为被动语态 _____ the floor ____ every day?

答案:Is the floor swept every day?
分析:
被动语态由be+过去分词构成,be随时态的变化而变化,
根据句中的“every day”可以判断,此句子是am/is/are +done (过去分词) 一般现在时 ,
改为被动语态后,主语变成“the floor ”,所以be动词应选" is ",
sweep-----过去分词------swept