英语中，表示请求、要求、命令、建议等名词advice, desire, decision, idea, instruction, order, plan, proposal, recommendation, request, requirement, suggestion, wish充当句子的主语而后面接表语从句或它们后面接同位语时，表语从表面上看几屗及同位语从句都须用虚拟语气。其虚拟语气的结构为：(should) + 动词原形。如：
We followed his advice that we should ask our teacher for help. 我们接受了他的建议：我们应该请求老师的帮助(from www.hxen.com)。
He told us his idea that he should go to university. 他告诉了我们他的想法：他想上大学。
His suggestion is that we should do our work more carefully. 他的建议就是我们的工作要更细心些。
Their plan is that they should build a new factory in their hometown. 他们的计划就是在家乡建一座新工厂。