一些形容词后的that 从句中用should +动词原形，should可以省略的虚拟语气，用于这种结构的形容词有：advisable， anxious，appropriate, better, compulsory, concerned, crucial, critical, desirable, eager, essential, fitting, imperative, important, impossible, improper, natural, necessary, obligatory, only fair, only just, only right, preferable, proper, reasonable, urgent, vital, willing,etc.
某些名词后的that 从句中，这些名词有：advice， agreement, command, decision, decree, demand, desire, determination , insistence, motion, necessity, order, plan, preference, etc.
某些表示建议，命令， 请求，要求等动词后的THAT从句中，这些动词有：
表示愿望的：desire, prefer, suggest的名词
表示建议的：advise, move (提议)， propose, suggest, recommend
表示请求、要求的：ask, beg, insist, maintain, oblige, request, urge,
表示命令的：command, decree, dictate, direct , order, stipulate
表示决定的：decide, determine, resolve
其他：arrange， deserve, intend, motion, promise