could/should/must/.加have done和have been done区别
问题描述:
could/should/must/.加have done和have been done区别
答
告诉我三者之间意思以及用法的区别! 谢谢了 should have done 表示假设如:He could have been very rich, but he cared for no money at all
答
情态动词+ have +过去分词 1) may(might) have + done sth, can (could) have + done sth 表示过去,推测过去时间里可能发生的事情. Philip may (might) have been hurt seriously in the car accident. Philip can (...