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Unit7 Teenagers should be allowed to choose their own clothes. Grammar & Writing 含情态动词的被动语态 can, could (能；会), may; might (可以) must(必须), should(应该), will; would(愿意) have to(必须；不得不), had better(最好) Grammar 1.含情态动词should的被动语态结构式： should + be+及物动词的过去分词。 (1)肯定句结构为：主语+should be+及物动词的过去分词+ (by+宾语)。 eg: 你应该自己完成作业。 Your homework should be finished by yourself. 含情态动词should的被动语态 (2)否认结构为：主语+ should + not+ be +及物动词的过去分词+ (by+宾语)。 eg：不应该允许青少年晚上外出。 Teenagers should not be allowed to go out at night. (3)特殊疑问句结构为:疑问词+一般疑问句？ eg：应该允许学生们做什么？ What should students be allowed to do? (4)一般疑问句结构为:Should +主语+ be+及物动词的过去分词+ (by+宾语)？ 答复:Yes，主语+should./No，主语 + shouldn’t. eg:这些小树应该每天浇水吗？ Should these young trees be watered every day? Yes, they should. /No, they shouldn’t. 对，应该。/不，不应该。 We sho