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    精英家教网 > 初中英语 > 题目详情
    20．-Can I go to the concert with you tomorrow，Mum？
    -Of course，if all your homeworkis done（do） by noon．

    分析 --我明天可以和你一起去音乐会吗，妈妈？
    --当然．如果你全部的作业都在中午之前完成了．

    解答 答案：is done．考查被动语态．句意"--我明天可以和你一起去音乐会吗，妈妈？--当然．如果你全部的作业都在中午之前完成了．"．homework是动作的承受者，因此用被动语态．be动词+动词的过去分词．homework不可数名词．在时间，条件，让步状语从句里，要用一般现在时表示将来，因此用be动词单数is．do的过去分词是done．答案是is done．

    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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