直接转化成延续性动词buycatch(get)acoldborrowcome/go/become/reachhavehaveacoldkeepbe短暂性动词延续性动词borrow----keepbuy------havedie------bedeadleave----beaway(from)open-----beopenclose---beclosedcome/go---be2
转换成be+介词短语jointhearmyjointhePartygotoschoolbeinthearmybeinthepartybeinaschool3转换成be+形容词或副词diefinishbeginleavefallasleepcloseopenbedeadbeoverbeonbeawaybeasleepbeclosedbeopen1
Howlongcanthey___________(借)thebook
They___________(借)thebooksinceaweekago
Lucy_____________________(离开)schoolforhalfanhour
Hisdog_______________(死)forthreedays
They____________(买)theoldhousesince1960
Thisshop________________________(开/关)sincetwoyearsago
John________________(来)inChinafortenyears
keephavekepthasbeenawayfromhasbeendeadhashadhasbeenopen/closedhasbeen1
我买了这辆自行车已经两年了
(buy---have)I________thebiketwoyearsago