2013年职称英语考试语法指导：情态动词4( i) p5 j2 U4 U; _9 }
情态动词+行为动词完成进行式 中华考试网(www．Examw。com) * L' J6 }5 n* r+ w 情态动词+行为动词完成进行式（即情态动词+ have been + v-ing 形式），表示推测或评论过去某动作是否正在进行或一直在进行。例如： ' U; D7 m) v' b R! D0 ~
1）They should have been meeting to discuss the problem. ; \, a! Y7 I( w h2 F/ t4 Q9 M 2）He may / might have been buying stamps in the post office when you saw him.
发表于 2012-8-15 23:36:10
