题目内容
2．You must throw the broken bottle away．（改为被动语态）The broken bottle mustbethrown away．
分析 你必须将漂亮的瓶子扔了．
解答 答案：be thrown．主语The broken bottle是动词throw的承受者，句中含有情态动词must故用情态动词的被动语态---情态动词+be+过去分词，throw的过去分词thrown，故答案是be thrown．
点评 情态动词的被动语态---情态动词+be+过去分词的呈现，各种类型的被动语态的构成要理解掌握．
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