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)suggestedIt is (2)important that… (should) do
(3) a pity
(1)suggested, ordered, proposed, required, demanded, requested, insisted； (should) do (2)important, necessary, natural, strangea 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.
