区分短暂性动词与延续性动词的正确使用 (1)-How long have you been there? - the end of last month. A.In B.By C.At D.Since (2)until 用于肯定句. 主句用延续性动词,用于否定句.主句用短暂性动词 I will wait until he comes back. I won’t leave until he comes back. (3)since 与短暂性动词连用.“自从做某事多长时间了 since 与延续性动词连用.“自从不做某事多长时间了 It is three years since I began to smoke. It is three years since I smoked. (4)while 从句的动词须用延续性动词 【查看更多】
