2013年职称英语考试语法指导：情态动词4 # |% w% `, m# l7 c4 F) |情态动词+行为动词完成进行式 中华考试网(www．Examw。com). d0 Z0 n$ Z7 A9 k
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： ! D& V2 g& o8 n" M; c
1）They should have been meeting to discuss the problem. - a& D% O5 h5 f% A0 U8 | 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
