特殊的虚拟语气词：should1) It is demanded / necessary / a pity + that…结构中的主语从句的谓语动词要用should 加动词原形， should 可省略。
句型： (1)suggested It is　 (2)important　　　　that…+ (should) do (3) a pity (1)suggested, ordered, proposed, required,　 demanded, requested, insisted; + (should) do (2)important, necessary, natural, strange a pity,　 a shame,　 no wonder (3)It is suggested that we (should) hold a meeting next week.
It is necessary that he (should) come to our meeting tomorrow.
2)在宾语从句中的应用 在表示命令、建议、要求等一类动词后面的从句中。
order, suggest, propose, require, demand, request, insist, command, insist + (should) do I suggest that we (should) hold a meeting next week.
He insisted that he (should ) be sent there.
注意： 如suggest, insist不表示建议 或坚持要某人做某事时，即它们用于其本意暗示、表明、坚持认为时，宾语从句用陈述语气。
The guard at gate insisted that everybody obey the rules.
判断改错: (错)　You pale face suggests that you (should) be ill.
(对)　 Your pale face suggests that you are ill.
(错)　 I insisted that you ( should) be wrong.
(对)　 I insisted that you were wrong.
3)在表语从句，同位语从句中的应用 在suggestion, proposal, idea, plan, order, advice等名词后面的表语从句、同位语从句中要用虚拟语气，即(should)+动词原形。
My idea is that we (should) get more people to attend the conference.
I make a proposal that we (should) hold a meeting next week.