含有情态动词的被动语态 温故 在英语中，动词有两种语态，即主动语态和被动语态。主动语态表示主语是动作的执行者，被动语态表示主语是动作的承受者。在八年级同学们已初步学习了被动语态，它的结构为：助动词be +及物动词的过去分词。 知新 本单元我们主要了解含有情态动词的被动语态。它的结构是什么呢？观察下面例句中含情态动词被动语态的各种形式，然后补全结论中所缺的内容。【例句】1. Many trees should be planted in the mountains. 应该在山上种许多树。2. You can take this book home. （改为被动语态）This book can be taken home (by you). 3. This problem cant be worked out very easily. 这道题轻易算不出来。4. Must the work be done at once? 这项工作必须立即完成吗？【结论】A. 含有情态动词的被动语态的结构为：情态动词+_+及物动词的_。B. 含有情态动词的主动语态变为被动语态时，要把主动语态的_变成被动语态的主语。C. 变为否定句时只需要在情态动词后加_。D. 变为一般疑问句时只需把_提到句首。Key: A. be, 过去分词 B. 宾语 C. not D. 情态动词【运用】. 选择最佳答案。( )Young trees should _ every year.A. be plantedB. plantedC. plant. 按要求完成下列各句，每空一词（含缩写）。1. We must do the work right now. （改为被动语态）_ _ _ _ _ right now.2. Teenagers should be allowed to go out with their friends on school nights. （改为否定句）Teenagers _ _ _ to go out with their friends on school nights.3. A book should be read each month. (改为一般疑问句)_ _ _ _ _ each month?Grammar Focus. A . 1. The work must be done 2. shouldnt be allowed3. Should a book be read