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1、Module4RulesandsuggestionsUnit3Languageinuse1.Tosummariseandconsolidatetheuseofmodalverbs2.Toknowmorerulesofeco-tourismObjectives情态动词Areyoufamiliarwiththesesentences?Theyareallfromthismodule.Observe1.Youmustbecarefuloffallingstones.2.Youmustn’twalktooclosetotheedgeofthehillpathbecauseyoumightfall
2、andhurtyourselves.3.Youshouldalwayswearproperclothes.4.Bearsmightthinkourrubbishisfood.5.—Canwegorockclimbing?—No,youcan’t.6.Youmustn’tgooffonyourown.7.Youmayneedsomewater.8.Weshouldhangthefoodinatreetonight.9.Theycansmellfoodfromalongwayaway.10.Bearsmightthinkourrubbishisfood.11.Noonecanrunfaste
3、rintheforestthanabear.12.Youmustn’tmakeanysuddenmovesormakeasound.Andaboveall,youmustn’trun.1.You________becarefuloffallingstones.2.You________(not)walktooclosetotheedgeofthehillpathbecauseyou_______fallandhurtyourselves.3.You________alwayswearproperclothes.4.Bears________thinkourrubbishisfood.5.
4、—______wegorockclimbing?—No,you_______(not).6.You________(not)gooffonyourown.mustmustn’tmightshouldmightCancan’tmustn’tgoReady?7.You________needsomewater.8.We________hangthefoodinatreetonight.9.They_______smellfoodfromalongwayaway.10.Bears________thinkourrubbishisfood.11.Noone________runfasterint
5、heforestthanabear.12.You________(not)makeanysuddenmovesormakeasound.Andaboveall,you_________(not)run.mayshouldcanmightcanmustn’tmustn’t以上我们已经通过归纳总结和练习对本课的语法内容有了一定的了解,下面就让我们根据之前练习的考察情况进一步选择讲解该语法项的重难点。语法讲解情态动词本身有一定的意义，但不能独立作谓语，只能与其后的动词原形一起构成谓语，表示说话人的情绪、态度或语气，用来表达建议、请求、可能或意愿等。情态动词没有人称和数的变化，情态动词后必须跟动
6、词原形。常见的情态动词有：can,could,may,might,must,need,shall,will,should,would。情态动词Canyouliftthisheavybox?(体力)Marycanspeakthreelanguages.(知识)Canyouskate?(技能)can,could此时可用beableto代替。can只有一般现在时和一般过去式;而beableto则有更多的时态。①表示能力(体力,知识,技能),常用情态动词can和could表达。如：I’llnotbeabletocomethisafternoon.(一般将来时)Hewasabletogotothe
7、partyyesterdayeveninginspiteoftheheavyrain.当表示“经过努力才得以做成功某事”时用beableto,不能用can。如：—CanIgonow?—Yes,youcan./No,youcan’t.—CouldIcometoseeyoutomorrow? —Yes,youcan.(No,I’mafraidnot.)此时可与may互换。在疑问句中还可用could,might代替，但could,migh
