PAGE\*MERGEFORMAT4Grammar学习目标：掌握情态动词的基本用法学习重点：掌握情态动词+havedone的用法1.maydo/mayhavedone/mighthavedone1)Itisgenerallybelievedthatsnakesmaybedangerous.对____________的推测2)Withsomuchworktodo,theymaynotgotothepartytomorrow.对____________的推测3)Sheseemstoknowthefilmquitewell.Shemayhaveseenthatbefore.对____________的推测4)Hemighthavegivenyoumorehelp,eventhoughhewasbusy.对____________的推测Conclusion：mayhavedone表示对_________________，用于肯定句中，意思是“__________”或“___________”。mighthavedone表示________________，might与may意思__________，但可能性____________，常用于虚拟语气中。eg:A:Hey,youlookworried.Whatiswrong?B:Ican’tfindmywallet.A:Iguess_______________________________（你可能把它忘在家里了）.B:Idon’tthinkso.A:or______________________________（你可能把它放在书包里了）.2.must/couldhavedoneTheymusthavelivedherelastyear,accordingtowhattheysaid.变成疑问句：变成否定句：对比:1)Childrenmustn’tplayfootballinthestreet,becauseitistoodangerous.2)Ididn’tseeherinthemeetingroomthismorning.Shecouldn’thavespokenatthemeeting.3)Youcouldhavedoneitbetter,butyouweretoocareless.4)Ifyoudoagoodjob,youmaytellyourselfthatitwasn’tgoodenoughorthatanyonecouldhavedoneaswell.HYPERLINK\l""Conclusion:musthavedone表示对______________，意为“____________”，语气十分肯定。can/couldhavedone常用于______________句，表示对过去发生的行为表示怀疑或不肯定，意为“______________”。用于肯定句时表示“________________”或者“_____________”。注意：情态动词could/may/might/must+havedone表示_________________。3.should/oughttohavedone1)Yououghtn’tto/shouldn’thavebeenlateforyesterday’sclassmeeting，asitwassoimportant.2)I’mnotfeelingwellinthestomach.Ididn’tfollowthedoctor’sadviceI’mnotfeelingwellinthestomach.I__________________thedoctor’sadvice.Conclusion:should/oughttohavedone用于肯定句时，表示_______________________；用于否定句时，则表示_______________________。didn’tneedto/needn’thavedoneTranslatethefollowingsentences:1)Iactuallyneedn’thaveboughtsomuchwine—onlythreepeoplecame.2)Ididn'tneedtosayanything,becausehestartedtalkingtomeaboutthelastfewarticleshehadreadonthewebsite.HYPERLINK\l""Conclusion:needn’thavedone表示本来________________，而实际上___________