题目内容
15.You must keep the noise under 50db here.( 改成被动语态)The noise mustbekept under 50db here.
分析 --你必须把噪音保持在50分贝以下.
--噪音必须被保持在50分贝以下.
解答 答案:be;kept.考查被动语态.被动语态的结构是be动词+动词的过去分词.情态动词must后跟be动词原形be,keep的过去分词是kept.答案是be;kept.
点评 被动语态表示主语是动作的承受者,被动语态由"be动词+及物动词的过去分词"构成,be动词的单复数要与主语的单复数保持一致,还要注意时态及过去分词的变法.
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