1、现在完成时中延续性动词和非延续性动词延续性动词studylearnsleeplivesingdanceswimdrinkteachkeep非延续性动词:buyborrowlenddieleavebegincome/go非延续性动词不能和howlong;for….since…连用要把它们变成其他相应的词.(买了…)have/hashad…(借了…)have/haskept…(开始了…)have/hasbeenon(离开了…)have/hasbeenaway(from)..(来到某地/去某地….)have/hasbeenin…(死了…) h