4、vebeen+done[注]被动语态没有将来进行时和过去将来进行时。【学法引领】完成一个任务: asksomestudentstoreadaboutaninventionusinganencyclopediaorotherbook fromthelibrary,orbylookingupinformationontheinternet.havethestudentswriteup ashortreportanddrawasimplepictureoftheinventionorbringinaphotoofit.askeach st