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.