题目内容

19．在北京很多公共场所不允许吸烟．（allow）
Smokingisn't allowed in many public places of Beijing．

分析 isn't allowed．

解答 答案：isn't allowed．这里需要表达出不允许，所给单词是allow允许，主语是smoking是allow的承受者，构成被动关系，再者这里是说客观事实，用一般现在时的被动语态am/is/are+过去分词，主语是动名词smoking，谓语动词用单数，加上not构成否定，故答案是isn't allowed．

点评 这里是对被动语态的考查，分词主谓关系和时态，确定用哪一时态的被动语态，这里要注意的是单个的动名词短语作主语谓语动词要用单数

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