特殊的虛擬語氣詞：should

 
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)importantthat…+ (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）在賓語從句中的套用
在表示命令、建議、要求等一類動詞後面的從句中。
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"，即它們用於其本意"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，同位語從句中的套用
在suggestion, proposal, idea, plan, order, advice等名詞後面的表語從句、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.