MainUnit3介词in的用法in:在……里面Theboyis___thebox.inon:在……上面Thegirlis____thebox.on介词on的用法under:在……下面Thecatis_____thebox.under介词under的用法infrontof:在……前面Thegirlis_______thebox.infrontof介词infrontof的用法behind:在……后面Thebirdis______thebox.behind介词behind的用法介词between、nextto的用法between:在……之间nextto:在……隔壁Theboyis______thetwoboxes.betweenTheboyis______theblue/redbox.nexttoMainUnit3介词大考验Jerryistheplate.介词大考验onJerryisthebottle.介词大考验inJerryisthecheese.介词大考验underTomislyingJerry.介词大考验behindJerryisstandingTom.介词大考验nexttoTheduckisJerryandTom.介词大考验betweenThebooksare___thebag.inThebooksare____thedesk.onTheballis_____thechair.underThecatisthebasket.inThecatisthechair.infrontofThecatisthedesk.onMainUnit3