Unit 7 Grammar & Writing.ppt

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1、Unit7Teenagersshouldbeallowedtochoosetheirownclothes.Grammar&Writing含情态动词的被动语态常用的情态动词有：can,could(能；会),may;might(可以)must(必须),should(应该),will;would(愿意)haveto(必须；不得不),hadbetter(最好)Grammar1.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+shouldbe+及物动词的过去分词+(by+宾语

2、)。eg:你应该自己完成作业。Yourhomeworkshouldbefinishedbyyourself.含情态动词should的被动语态(2)否定结构为：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。Teenagersshouldnotbeallowedtogooutatnight.(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？Whatshouldstudentsbeallowedtodo?(4)一般疑问句结构为:Should+主语+be

3、+及物动词的过去分词+(by+宾语)？回答:Yes，主语+should./No，主语+shouldn’t.eg:这些小树应该每天浇水吗？Shouldtheseyoungtreesbewateredeveryday?Yes,theyshould./No,theyshouldn’t.对，应该。/不，不应该。主动句变被动句的步骤与其它情况相同。WeshouldallowteenagerstowatchTVonSunday.TeenagersshouldbeallowedtowatchTVonSunday(byus).People

4、maycatchfishintheriver.Fishmaybecaughtintheriver(bypeople).1.Icanfinishthework.Theworkcanbefinishedbyme.一般问句：Cantheworkbefinishedbyyou?2.Weshouldplantmanymoretrees.Manymoretreesshouldbeplantedbyus.一般问句：Shouldmanymoretreesbeplantedbyus?PracticeTeenagersshouldbeallo

5、wedtodrivethecar.3.Parentsshouldallowteenagerstodrivethecar.一般问句：Shouldteenagersbeallowedtodrivethecar?Treesmustbewateredeveryday.4.Theymustwatertreeseveryday.一般问句：Musttreesbewateredeveryday?Sixteen-year-oldsshouldbeallowedtodrive.(改为否定句)Sixteen-year-oldsshouldn’t

6、beallowedtodrive.Ithinktheworkshouldbedoneatonce.(改为否定句)Idon’tthinktheworkshouldbedoneatonce.1.Theflowers___often.A.mustbewaterB.mustbewateredC.mustwateredD.mustwater2.Thebooksmay___fortwoweeks.A.bekeptB.beborrowedC.keepD.borrow3Thebrokenbike____herebyMrSmith.A.ca

7、nmendB.canmendedC.canbemendD.canbemended4.Youngtreesshould________everyyear.A.beplantedB.plantedC.plantD.areplantedWriting本单元写作针对某人、某事或某活动制定规则或提建议。写此类短文时，最重要的是掌握情态动词的用法以及相关句型。再根据所给的提示、要求等明确中心内容，就能写出一篇好文章来。常用句型归纳如下：1.Wemust/can…;2.Wemustn’t/can’t…;3.Weshould/should

8、n’t…;4.Weshould/shouldn’tbeallowedto…;5.You’dbetter…;6.Whynot…假设你叫大明，你的一个美国笔友托尼将到中国来并在你们班学习。请写信告诉他你们班的班规，80词左右。写作注意点1.语态、时态要准确无误。2.主谓语要一致，主语的人称和数要和谓语一致