1） It is demanded / necessary / a pity + that…結(jié)構(gòu)中的主語從句的謂語動(dòng)詞要用should 加動(dòng)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(yīng)用
    在表示命令、建議、要求等一類動(dòng)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(jiān)持要某人做某事時(shí)"，即它們用于其本意"暗示、表明"、"堅(jiān)持認(rèn)為"時(shí)，賓語從句用陳述語氣。
    The guard at gate insisted that everybody obey the rules.
    判斷改錯(cuò):
    （錯(cuò)）　You pale face suggests that you (should) be ill.
    (對(duì))　 Your pale face suggests that you are ill.
    (錯(cuò))　 I insisted that you ( should) be wrong.
    (對(duì))　 I insisted that you were wrong.
    3）在表語從句，同位語從句中的應(yīng)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(dòng)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.