It is necessary that+从句?
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)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.
资料拓展：
虚拟语气用来表示假想，而不表示客观存在的事实，所说的是一个条件，不一定是事实，或与事实相反。虚拟语气通过谓语动词的特殊形式来表示。英语中的语气分为陈述语气、祈使语气、虚拟语气三类。虚拟语气表示说话者做出的假设并非事实，或难以实现的，甚至表达相反的概念。另外表示主观愿望或表达某种强烈的感情时，也用虚拟语气。
在表示假想的虚假的、与事实相反的或难以实现的情况时用虚拟语气，表示主观愿望或某种强烈情感时，也用虚拟语气。即当一个人说话时欲强调其所说的话是基于自己的主观想法，愿望，假想，猜测，怀疑或建议，而不是根据客观实际，就用虚拟语气。主要是英语语法的一种表达。
戢蒲哌拉： 这与it's necessary无关,完全是to和for的区别for 后面接人或物,表示“对于……来说很重要”的意思to后面一般接动词,是个连接词,全句意为“做什么什么很重要”
浮梁县17765368309： 英语语法问题 it is necessary that - ？
戢蒲哌拉： 虚拟语气.it is necessary that ...后面跟的要用虚拟语气,因为只是必要的事情,但是还没有发生的,只是设想的,这就是虚拟.虚拟的结构用 should be built ,可以省略should
浮梁县17765368309： it is necessary that是什么意思 - ？
戢蒲哌拉： it is necessary that 这是必要的,望采纳,谢谢
浮梁县17765368309： It is necessary to是什么意思 - ？
戢蒲哌拉： It is necessary to:有必要 It is necessary to guard against disastrous fires when burning wild bushes and weeds. 放荒时一定要提防火灾.
浮梁县17765368309： it is necessary ......是什么意思? - ？
戢蒲哌拉： it is necessary ...表示...是必要的全句意思就是:他们为了与这些人交流并向他们学习,学习这门语言是必要的
浮梁县17765368309： it is necessary that 从句什么时候用虚拟什么时候不用 - ？
戢蒲哌拉： 该句型后面应该接should do 形式,其中should可省略,如:It's necessary that you (should) hand in your homework today. 类似句型还有it is strange/important...that sb (should) do...
浮梁县17765368309： It is necessary的用法 - ？
戢蒲哌拉： It is necessary for sb to do sth.对某人来说做某事是必要的!
浮梁县17765368309： It is necessary that the problem be settled at once. - ？
戢蒲哌拉： 虚拟语气,It is necessary that+后跟(should) +动原
浮梁县17765368309： It is necessary to do 的例句 - ？
戢蒲哌拉： it is necessary to的例句: It is necessary to keep the offices neat . 有必要保持办公室的整洁.I it is necessary to learn a foreign language . 我认为学习一门外语是必要的.In this situation it is necessary to rank the projects . 在这种情况下,有必...
浮梁县17765368309： it necessary it's necessry的区别 - ？
戢蒲哌拉： It's necessary 可以是句子 (ie. It is necessary 这是必要的) it necessary 被放句子的中间 eg. It is necessary to boil water before drinking 饮用前有必要烧好开水 eg. I find it necessary to boil water before drinking同样意思, 不同表达, 第二句 it 等于 ＂boil water before drinking＂ 这个动作
