1） It is demanded / necessary / a pity + that…結構中的主語從句的謂語動詞要用should 加動詞原形， 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）在賓語從句中的應用
　　在表示命令、建議、要求等一類動詞后面的從句中。
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"建議" 或"堅持要某人做某事時"，即它們用于其本意"暗示、表明"、"堅持認為"時，賓語從句用陳述語氣。
　 The guard at gate insisted that everybody obey the rules.　
　判斷改錯:
　（錯）　You pale face suggests that you (should) be ill.
　 (對)　 Your pale face suggests that you are ill.
　 (錯)　 I insisted that you ( should) be wrong.
　 (對)　 I insisted that you were wrong.
3）在表語從句，同位語從句中的應用
　　在suggestion, proposal, idea, plan, order, advice等名詞后面的表語從句、同位語從句中要用虛擬語氣，即（should）+動詞原形。
　　 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.