题目内容

18．I cleaned my teeth twice before I got to bed last night．（变被动语态）My teeth were cleaned twice before I got to bed last night．．

分析 昨晚上床睡觉前我刷了两次牙．
昨晚上床睡觉前，我的牙齿刷了两次．

解答 答案：My teeth were cleaned twice before I got to bed last night．my teeth是动词clean的承受者，够成被动关系，结合时态一般过去时用一般过去时的被动语态was/were+过去分词，主语my teeth复数，故were，clean的过去分词cleaned，故答案是My teeth were cleaned twice before I got to bed last night．

点评 一般过去时的被动语态was/were+过去分词的呈现，课下要理解记忆各种被动语态的构成．

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