1) 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.