情态动词+动词完成式即“情态动词+ have + done分词 .表示对过去行为或动作进行推测.评论或判断. 1. must have done表示对过去某事的肯定猜测.其否定或疑问形式都用can 来表示. Since the road is wet, it must have rained last night. He can’t have missed the way. I drew him a map. “The dictionary has disappeared. Who could have taken it? 当然对现在发生或将来发生的事情,要用must do 表示猜测, 否定为can’t do. He must understand that we mean business. You must be hungry after a long walk. 【查看更多】
