情态动词完成时的推测.ppt

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1、Whyistheroadsowet?Itmusthaverainedlastnight.A:Wherearethegirls?Cantheyhavegonehome?B:No,theycan’thavegonehome.It’ssoearly.--Look,thelightsareoffintheirroom.--Wherehavetheygone?--Theymighthavegonetothecinema.A:Hereisadollforyourdaughter.B:Thankyousomuch.It’sbeautiful.Buty

2、ouneedn’thaveboughtit.Shehassomanyathome.FindingtheruleModalverbs+havedoneExplanationsExamplesentencesmusthavedoneItmusthaverainedlastnight.Believingwhathappenedinthepastisthecase(usedonlyinpositivesentences)can/couldhavedone--WhereisJohn?Canhehavegonetotheplayground?--N

3、o,hecan’thavegonetotheplayground.Itisraining.indicatingthatsomethingwasapossibilityinthepast,thoughitdidnotactuallyhappen(negativeorinterrogativesentences)may/mighthavedoneTheymighthavemistakenyou.Suggestingthatitispossiblethatsomethinghappenedorwastrue(usedonlyinpositiv

4、e/negativesentences)should/shouldn’thavedoneYoushouldhavedoneyourhomeworkfirst.indicatingthatsomethingdidnot/didhappen,butthespeakerwishesithad(not)happened.needn’thavedoneYouneedn’thavewateredtheplant.Itrainedlastnight.indicatingthatitisnotnecessaryforsb.todosth,thoughh

5、e/shedidit.musthavedone对过去的非常肯定的推测（语气最强）对已发生的过去情况的推测，若陈述句谓语部分有“musthavedone”，而且有表示过去的时间状语,问句部分用didn't；1)Theymusthavegonetherelastnight,didn'tthey?2)Theymusthavearrivedbynow,haven’tthey?对已发生的过去情况的推测，若陈述句谓语部分有“musthavedone”，若没有表示过去的时间状语，问句部分用haven’t或hasn’t.3)Hemusthavebee

6、ntotheGreatWall,hasn'the?对已发生的过去情况的推测，若陈述句谓语部分有“musthavedone”，若没有表示过去的时间状语，问句部分用haven’t或hasn’t.这个房间昨天肯定被清扫了。Theroom_____________________yesterday.musthavebeencleaned他一定已经背了5000单词了。He_____________5,000words.musthavelearntYoumusthaveseenthefilm“JourneytotheWest”,__________

7、_?haven’tyouTheymusthavebeentotheWorldExpolastweek,_________?didn’ttheycanhavedone对过去的疑问推测can’thavedone对过去的否定推测疑问句和否定句--WhereisJohn?Canhehavegonetotheplayground?--No,hecan’thavegonetotheplaygroundItisraining.--____MrKing_____________theletter?金先生已经收到那封信了吗？--No,he________

8、__________it.不，他不可能收到。Canhavereceivedcan’thavereceivedmay/mighthavedone某事有可能发生过(表示对过去的不太肯定的推测，语气比mustha