Unit4ThenandnowA.Let’slearnLet’sguessTherearemanybooksinit.Wecanreadbooksinit.Whatisit?It’sa___________.libraryThereareteachersinit.Theyoftenworkthere.Andyouoftenhandin（上交）yourhomeworkthere.Whatisit?It’sa___________________.teachers’officeTherearemanycomputershere.

Youcanlearnhowtousecomputers.

Whatisit?It’sa___________.computerroom

Therearetwoblackboards.

Therearemanydesksandchairsinit.Whatisit?

It’sa___________________.classroomWhatcanyouseeinourclassroom?

Thereis/are…Fiveyearsago(五年前),therewasno…now5yearsagoWhatdifferencescanyoufind?Fiveyearsago(五年前),

therewasno…computerTVfandininghallgymgrass（T:What’sthis?Whoseschool?What’stheschoollike?）Therewasno20yearsago.gymTherewasno10monthsago.dinninghallTherewasnolastyear.grassTherewerenolastmonth.treesgobybikeCanyouread?dinninghallgymgrass……yearsago……monthsagolastyearlastmonthThereisadininghallintheschoolnow.Now(現(xiàn)在)Then（那時(shí)）Therewas

nodininghallintheschoolThereisagymintheschoolnow.Therewas

nogymintheschoolTherearesometreesintheschoolnow.Therewere

notreesintheschoolWuYifan’sschoolThereisgrassintheschoolnow.Therewas

nograssintheschool20yearsago.10monthsago.lastyear.lastmonth.Therebe句型現(xiàn)在時(shí)Thereis+單數(shù)……Thereare+復(fù)數(shù)……過去時(shí)Therewas+單數(shù)……Therewere+復(fù)數(shù)……

Tips:There是個(gè)近視眼，只能看到最近的，最近的是單數(shù)用is，是復(fù)數(shù)用are；如果是表示過去的，單數(shù)用was，復(fù)數(shù)用were1、There____anappleonthetable.A.isB.wasC.are2、There____twoapplesinthebasket.A.isB.wasC.are3、There____anapple,twopearsandfivewatermelonsonthetable.A.isB.wasC.areACA4、There____nogymsinmyschool2yearsago.A.wasB.areC.were5、There____nograssinmyschoollastyear.A.wasB.areC.were6、There____nogym,nodinninghallsandnolibraryinmyschoolsixmonths