题目内容
4.You have to stay behind if your homework before five o'clock.( )| A. | isn't done | B. | won't be done | C. | doesn't do | D. | wasn't done |
分析 如果你在五点前没有完成作业,你必须留下.
解答 答案:A 根据your homework before five o'clock.可知主语homework是动作的承受者,与动词do构成被动关系,应该用被动语态.根据句中if引导的是条件状语从句,应该用一般现在时表将来.一般现在时的被动语态否定式的构成:am/is/are+not及物动词的过去分词.主语your homework,所以应该是isn't done,故选:A.
点评 主要考查被动语态,当句子的主语是动作的承受者时,应该用被动语态,本题考查的是一般现在时态的被动语态.一定注意其构成形式,一般现在时的被动语态的构成:am/is/are+及物动词的过去分词.
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