大学英语语法课件Lecture7TensesandVoices.ppt

文档介绍：(P59)6A(P63)7C(P82)TensesSimplePresentSimplePastPresentProgressivePastProgressivePresentPerfectivePresentPerfectiveProgressivePastPerfectivePastPerfectiveProgressiveConstructionsdenotingfuturetimePresentPerfectivehave/hasdonefor/since/already/just/never/ever/before/yet/lately/recently/sofar/inthelast(past)fewyears/’-in-、短暂性动词段动词、延续性动词Buy/borrow/leave/join/die/e/go/lose/begin/stop/arrive/?,如果现在完成时的谓语动词是点动词的否定形式,那么这种动作是可以延续的。Hehasn’’’s(time)since…It’’’’’sbeen6weekssinceIwasmarried.