小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.comSectionⅢGrammar——情态动词和过去将来时一、复习情态动词情态动词表示说话人对某一动作或状态的态度。初中阶段大家已经学习了一些情态动词，这里将对情态动词的特征、功能和用法进行总结。[观察例句]1．OliverbelievesthatwithamillionpoundbanknoteamancouldliveamonthinLondon.2．Youngman，wouldyoustepinsideamoment，please?3．Mayweaskwhatyou'redoinginthiscountryandwhatyourplansare?4．Ican'tsaythatIhaveanyplans.5．Anyway，Ididn'tdaretotryagain.6．Youmustn'tworryaboutthat.7．Ifyou'llexcuseme，Ioughttobeonmyway.[归纳用法]1．情态动词的基本特征(1)在形式上，情态动词没有实义动词的各种变化，只有could，would，hadto，might等几个过去式，其他情态动词如must、oughtto等的过去式皆与现在式同形。(2)在意义上，大多数情态动词有多个意义，如can可以表达“能力；可能；许可”等。(3)在用法上，情态动词与助动词一样，需后接动词原形，构成谓语动词。2．情态动词的否定式及缩略形式情态动词否定式缩略形式情态动词否定式缩略形式cancannot/cannotcan'tshallshallnotshan'tcouldcouldnotcouldn'tsouldshouldnotshouldn'tmaymaynot/willwillnotwon't小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.commightmightnotmightn'twouldwouldnotwouldn'tmustmustnotmustn'tneedneednotneedn'tdaredarenotdaren'toughttooughtnottooughtn'tto3.情态动词的主要表意功能用法例句表示能力Thelittleboycanreadandwrite.Icouldfeelthegroundshaking.表示可能和推测Thoseofyouwhoarefamiliarwiththegamewillknowthis.Theymadeabetwhichwouldsettletheirargument.Oh，youmustbeSylvia'shusband.Itmayseemluckytoyoubutnottome.Thatmightnotbetrue.Thereoughttobeenoughspaceforallofus.表示许可或禁止Youcangooffdutynow.Youcan'topenituntiltwoo'clock.Youmaynotsmokehere.Youshouldn'ttakeherhelpforgranted.Youmustn'tdothat.表示发出指示或提出请求Willyoupleasetakehertothelibrary?Couldyouoffermeworkhere?CanIaskaquestion?Mayweaskwhatyou'redoinginthiscountry？表示提出帮助或发出邀请Willyoustayforlunch?Wouldn'tyouliketocomewithme?MayIhelpyou?ShallIputitinabox？表示提出建议Youcouldasktheteacherforhelp.Youshouldwritehimaletter.ThecookiesSusanmadearedelicious，yououghttotrysome.表示愿望Wouldyourecommendtheplaytootherpeople?Iwouldliketoknowthedate.小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.comI'dlovetogotoyourbirthdayparty.I'drathernotpayyounow.表示义务和需要Youmustcomeatonce.Wehavetowearuniformsatschool.Ioughttobeonmyway.4.情态动词难点透视英语中的情态动词虽然为数不多，但是要掌握好它们的用法并不容易。下面结合同学们在使用情态动词时不易掌握的难点谈几点看法。(1)①can表示可能性时，指的是理论上的可能，它通常不用来表示某事实际发生的可能性或真实性。如：Accidentscanhappen.Anybodycanmakemistakes.如果我们要表达某事发生的实际可能性，要用may，could或might等。WemayspendoursummerholidaysinHangzhouthisyear.Willyouanswerthetelephone？Itcould/may/mightbeyourmother.②could用来征求意见时，语气要比can委婉，但在回答问题时我们不能用could，因为语气委婉，可能性就变小了。如：—CouldIuseyourtelephone?—Yes，pleasegoahead.③在过去时态的肯定句中需要某种条件或努力做成某事，我们要用was/wereableto而不能用could。如：Itwasaholidayandthechildrenwereabletogototheseaside.Thegirlworkedhardsoshewasabletopassthefinaltest.(2)must与haveto都可以表示“必须”的意思，但要注意以下两点区别。①must只有现在时，...