题目内容
2.大家都应该意识到垃圾必须扔进垃圾桶.Everyone should realize that rubbishmust be thrown into the dustbin.
分析 must be thrown into
解答 答案:must be thrown into
扔进threw into,rubbish是动词throw 的承受者,构成被动关系,必须用情态动词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,扔进threw into,故答案是must be thrown into.
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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