提供建议、命令、要求等时that从句+should do
例：They have proposed that Felix should move to their Munich office.
We advised that the company should not raise its prices.
should后通常可以跟be+动词过去分词或be+形容词
例：They directed that the building should be pulled down.
We insist that the money should be available to all students in financial difficulties.
在正式书写中，should通常可以省略，仅保留动词原型，这种形式是虚拟语气现在时。除以下示例，其它用在虚拟语气现在时的动词有advise, ask, beg, command, demand, insist, instruct, intend, order, prefer, recommend, request, require, stipulate, suggest, urge, warn。
例：They have proposed that Felix move to their Munich office.
They directed that the building be pulled down.
表否定时在动词前加not
例：We adivsed that the company not raise its prices.
在不太正式的场合中，从句动词可用正常的一二人称及三单形式变化，来代替从句虚拟语气
例：I suggested that he should give up golf. （否定：...that he shouldn't give up...）
I suggested that he give up golf. （正式）（否定：...that he not give up...）
I suggested that he gives up golf. （非正式）（否定：...that he doesn't give up...）
主句名词后可以跟that从句+should或虚拟语气
例：The police issued an order that all weapons （should）be handed in immediately.
The weather forecast gave a warning that people (should) prepare for heavy snow.
It+be+形容词后that从句可用should或虚拟语气，此类形容词除以下示例还有advisable, appalling, appropriate, (in)conceivable, crucial, essential, imperative, important, obligatory, (un)necessary, urgent, vital.
例：It is inappropriate that he (should) receive the award again. （或...that he receives...）
that从句中用should可以表示说话人对某事的个人感受或反应，此形式常见于be+形容词后，此类形容词除以下示例还有amazed, amused, anxious, astounded, disappointed, shocked, surprised, upset。注意这种句型中如果省略should，必须用常规动词变形而不是虚拟语气
例：I am concerned that she should think I stole the money （或...that she thinks...）
that从句含should可以来表达目前依然存在或将来可能存在的情形
例：It's not surprising that they should be seen together-ther're brothers.
We believe it is important that she should take the exam next year.
如果要谈论一个目的和计划，比起should, 更常用虚拟语气。
例：I've arranged that she come to the first part of the meeting. （或...that she should come.../...that she comes.../...for her to come...）
动词+that（should通常省略）+do
这些动词包括：
ask、advise（建议、劝告、忠告）、
beg（乞求、请求）、
command（命令、指挥）、
decide（决心、下决心）、
demand（需求、要求）、
deserve（应得、值得）、
desire（欲望、渴望）、
determine（（使）下决心、（使）做出决定）、
direct（指挥、直接的）、
insist坚持、坚称
order（命令）、
prefer（宁愿、提出、更喜欢偏爱哪一个）、
propose（建议、打算）、
request（请求）、
require（要求、命令）、
recommend（推荐、介绍、劝告、建议）、
suggest（提议、建议）
urge催促
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