shall should may might can could must虚拟语气的用法与区别比较_百 ...答:一些常见的句型中,就会出现这种虚拟语气,而处于从句之中,should 常常被省略掉 o suggest, advise, propose, recommend, plan; o demand, order, direct, arrange, command, decide; o require, request; o think, expect, believe, insist, suspect. 由于他们的含义中包含"建议,假设,应该"这类的含义,所以,由...