虚拟语气在主语从句中的用法。
在“It is + 形容词important (strange, natural, necessary) that…”这类句型中，that所引导的主语从句中的谓语动词常用 “(should)+动词原形”结构，should可以省略，表示某事是“重要”，“奇怪”，“自然”，“必要”等意义。
或在“It is suggested, advised, ordered that…” 这类句子中，也就是上面宾语从句中相关动词的被动形式的主语从句中，谓语动词也要用should do，should可省。如：
It is important that every Beijinger (should) be able to speak English. 重要的是每个北京人能说英语。
It is necessary that he (should) be sent to hospital at once. 有必要马上把他送医院。
It is suggested that you set out immediately.
IV. 虚拟语气在表语从句(或同位语从句)中的用法。
当主语（或同位语先行词）为advice, suggestion, order, proposal等词时后接表语（同位语）从句，从句中的谓语动词常用“(should)+动词原形”结构，表示某人建议、劝告、命令等的内容。如：
My advice is that you should practise speaking English as often as possible.我的建议是你尽可能经常地练习说英语。
You should take my advice that you practice speaking English as often as possible.
The order from the commander was that the troops should set off for the front immediately.司令官的命令是部队立即开拔去前线。
The order came that the work should be finished two days ahead of time.提前两天完成工作的命令传来了。
Reluctantly she accepted their proposal that she should be operated on.她勉强接受了他们要她去接受手术的建议。
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