1、现在进行时；进行时；现在进行；表将来；正在做某事。例句：I have started planning out what I shall be doing next week. 我已开始详细安排下周要干的事儿了。2、“情态动词+be?doing”表示推测或评论某动作是否正在进行。例句：Our?teacher?must?be?correcting?our?exam?papers.我们的老师想必在批改试卷。3
be (am, is, are) +V-ing 为现在进行时。现在进行时：表示此时此刻正在进行的动作。句形：主语+am/is/ are + V-ing否定句：主语+am/is/ are +not + V-ing疑问句：Am/is/are +主语+V-ing特殊疑问句：特殊疑问词(what, when, where...) +be+ V-i
