题目内容
18.我们每天都打扫课室.The classroomiscleanedbyus every day.
分析 is cleaned by us.
解答 答案:is cleaned by us.主语The classroom是动词clean的承受者,结合 every day可知表达的是客观事实用一般现在时的被动语态be+过去分词,主语The classroom故is,动作的执行者是我们,故by us,故答案是is cleaned by us.
点评 被动语态由"助动词be+及物动词的过去分词"构成.被动语态的时态变化只改变be的形式,过去分词部分不变.疑问式和否定式的变化也如此.
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