Whosevolleyballisthis?ItmustbeCarla’s.Shelovesvolleyball.Whosehairbandisthis?ItcouldbeMei’shairband.OritmightbelongtoLinda.Theybothhavelonghair.Whatdidyouseethatnight?I’mnotsure.Butitcan’tbeadog.Itwasbigger.Ithinkitmightbeabearorawolf.GrammarFocusWhatmightwefocuson?4aChoosethebestwaytocompleteeachsentenceusingthewordsinbrackets.1.A:Where’sJean?B:I’mnotsure.She________(is/mightbe/mustbe)inthelaboratory.2.A:Everyoneisgoingtothepoolafterschool.B:Really?It_______(mustbe/can’tbe/couldbe)hotoutdoors.3.A:That’sthephone.B:Hmm.Iwonderwhoit_______(mustbe/couldbe/shouldbe).4.A:IwonderiftheseareJim’sglasses.B:They________(can’tbe/mightbe/couldbe)his.Hedoesn’twearglasses.5.A:Ihearwaterrunninginthebathroom.

B:It_________________(couldbe/mustbe/can’tbe)Carla.Shewasthinkingoftakingashower.mightbemustbecan’tbecouldbe/mustbecouldbeTip:Remembertocirclethekeywordstohelpyou.4aChoosethebestwaytocompleteeachsentenceusingthewordsinbrackets.1.A:Where’sJean?B:I’mnotsure.She________(is/mightbe/mustbe)inthelaboratory.2.A:Everyoneisgoingtothepoolafterschool.B:Really?It_______(mustbe/can’tbe/couldbe)hotoutdoors.3.A:That’sthephone.B:Hmm.Iwonderwhoit_______(mustbe/couldbe/shouldbe).4.A:IwonderiftheseareJim’sglasses.B:They________(can’tbe/mightbe/couldbe)his.Hedoesn’twearglasses.5.A:Ihearwaterrunninginthebathroom.

B:It_________________(couldbe/mustbe/can’tbe)Carla.Shewasthinkingoftakingashower.mightbemustbecan’tbecouldbe/mustbecouldbeexperiments(n.實驗)Canyougiveyourresponses?1.A:Where’sJean?B:I’mnotsure.Shemightbeinthelaboratory.C:______________________________________D:_____________________________________2.A:Everyoneisgoingtothepoolafterschool.B:Really?Itmustbehotoutdoors.C:_____________________________________D:______________________________________3.A:That’sthephone.B:Hmm.IwonderiftheseareJim’sglasses.C:______________________________________D:_______________________________________4.A:IwonderiftheseareJim’sglasses.B:C:______________________________________D:______________________________________5.A:Ihearwaterrunninginthebathroom.

B:Itcould/mustbeCarla.Shewasthinkingoftakingashower.C:_______________________________________D:________________________________________4bCompletetheseresponses.1.A:Manypeoplearewearingcoats.B:Theweathermustbe__________________________.2.A:Sallyhasbeencoughingalot.B:Shemightbe____________________.3.A:Thisrestaurantisalwaysverycrowed.B:Thefood_____________________.4.A:WheneverItrytoreadthisbook,Ifeelsleepy.B:Itcan’t__________________.gettingcolderhavingasorethroat/illmustbedeliciousbethatboring/coldoutsideweatherconditionsreasonsforherillnessthequalityofthefoodthecommentonthebook4cLookatthispictureofaroom.Howmuchca