sectionAgrammarsectionAgrammarsectionAgrammarsectionAgrammar八下英语八下英语Unit3CouldyoupleasecUnit3Couldyoupleasecleanyourroom?leanyourroom?八下英语八下英语Unit3CouldyoupleasecUnit3Couldyoupleasecleanyourroom?leanyourroom?enjoydinnerwithmyfamily.A:Mum,couldIgooutfordinnerwithmyfriends?BSththldbOKA:CouldIgetsomethingtodrinkwithmyfriendsafterthemovie?B:Sure,youcan.A:CouldIgetsomethingtodrinkwithmyfriendsafterthemovie?B:No,youcan’t,youhaveabasketballgametomorrow.takethedogforawalk遛狗A:Canyoupleasetakethedogforawalk?B:OK,butIwanttowatchoneshowfirst.takeouttherubbish扔垃圾A:Canyoupleasetakeouttherubbish?B:Yes,sure.CouldIgooutfordinnerwithmyfriends?Sure,thatshouldbeOK.Couldwegetsomethingtodrinkafterthemovie?No,youcan’t,youhaveabasketballgametomorrow.GrammarFocusGrammarFocusCanyoupleasetakethedogforawalk?OK,butIwanttowatchoneshowfirst.Canyoupleasetakeouttherubbish?Yes,sure.只作情态动词的can/could,may/might,oughtto,must可情态可实义的need,dare可情态可助动词的shall/should,will/would相当于情态动词的haveto,usedto情态动词的语法特征1)情态动词不能单独做谓语,除ought和have外,后面只能接不带to的不定式。2)情态动词没有人称,数的变化,但有些情态动词,如can、will也有一般式和过去式的变化。3)情态动词的“时态”形式并不是时间区别的主要标志,不少情况下,情态动词的现在式形式和过去式形式都可用来表示现在时间、过去时间和将来时间。1)can的主要用法是：A.表示体力或脑力的能力：e.g.Thegirlcandanceverywell.B.表示说话的推测﹑事物的可能性等:e.g.Canthenewsbetrue?C.在口语中,can可以表示请求或允许:e.g.CanIsithere?can和could：can表示“能够”时与短语beableto同义，但can只用于一般现在时或过去时，而后者可用于各种时态。另外，can表示个人有某种能力，而beableto表示某人通过努力、克服困难做成某事，相当于succeedindoingsth.；叙述过去事实时，最好用was/wereableto，因为could只表示过去具有某种能力。如：CanyouunderstandthedifferentkindsofEnglishthesepeopleareusing?Twoyearslater,hewasabletospeakverygoodChinese.2)could的主要用法是：A.could是can的过去式,表示与过去有关的能力和推测:e.g.Weallknewthattheyoungmancouldn’tbeadoctor.B...
