it's essential/imperative/important/necessary th 高中英语中，should是怎么省略的
It is essential/important/imperative/obligatory/necessary/mandatory that... \u540e\u53ef\u52a0sb.must do\u5417\uff1f\u540e\u9762\u8ddf\uff1asb. do sth.
\u82f1\u56fd\u82f1\u8bed\u4e5f\u53ef\u4ee5\uff1asb. should do sth.
\u8fd9\u662f\u865a\u62df\u8bed\u6c14\u4e2d\u7684\u4e00\u79cd\u7528\u6cd5\u3002
\u6b64\u5904\u662f\u5728\u8868\u793a\u5fc5\u7136\u6027\u3001\u91cd\u8981\u6027\u65f6\uff0c\u5c06\u4ece\u53e5\u4e2d\u7684should\u7701\u6389\u800c\u53ea\u7528\u539f\u5f62,\u7406\u8bba\u53ea\u80fd\u662f\u4e0e\u5b9e\u8df5\u201c\u88ab\u7ed3\u5408\u201d\uff0c\u6240\u4ee5\u7528\u88ab\u52a8\u5f0f\uff0c
\u53e6\u5916\u8fd8\u6709\u5728\u8868\u793a\u547d\u4ee4\u5efa\u8bae\u7b49\u65f6\uff0c\u4ece\u53e5\u4e2d\u7684should\u53ef\u4ee5\u7701\u6389\u5982\uff1ait was ordered that the troops (should) be pulled back.
下面的你可以看看，也可以不看。很少跟时态一般现在时，当然，如果不是考试，平常用也没有那么讲究。
在It is imperative(essential，necessary，appropnate，desirable，important，vital...等)+that引导的主语从句中谓语动词应该用虚拟语气的形式，即使用动词原形或should+动词原形。例如：
1.Itis vitallyimportantthatthey receive allthe help available.极为重要的是他们要得到所有可能得到的帮助。(《麦克米伦高阶英汉双解词典》)
2.It is important that you(should)keep your promise.你应该遵守诺言，这一点很重要。(《外研社·建宏英汉多功能词典》)
3.The president said it was imperative that the release of all hostag be secured.总统说当前要务是确保所有人质都获释。(《剑桥高阶英汉双解词典》)
4.It is essential that our prices remain competitive.我们保持价格方面的竞争优势是至关重要的。(《剑桥高阶英’汉双解词典》)
5.Itismostdesirablethatthey shouldboth come.他们两个人都来，这最好不过了。(《牛津高阶英汉双解词典》)
6.Il is desirable that you should have some familiarity with computers.你应该对计算机知识有所熟悉，这是很有益处的。(《朗文当代高级英语辞典》)
7.Itis advisablethattheygowithaclearlydefined goal.m mind.他们去时宜在思想上有一个明确的目标。(《译文·英汉大词典》)
8.It is appropriate that the exhibition should besponsored by BMW.这个展览会由BMW来主办是恰当的。(《外教社·柯林斯英汉双解学习词典》)
但是一个事实是：在It is necessary(essential，imperative，appropriate,desirable，important，vital...等)+that引导的主语从句中谓语动词用一般现在时的情况也绝非罕见。在大家熟悉的词典里很容易找到这样的例句。例如：
1.It is absolutely vital that the matter is keptsecret.这件事要保密，这是至关重要的。(《牛津高阶英汉双解词典》，2002年版，p.1695)
2.It is absolutely imperative that these safetymeasures are implemented immediately.这些安全措施必须立刻执行。(《朗文当代高级英语辞典》，外研社2004年版，p.980)
3.It is essential that the On is checked every10,000 km.每行驶10000公里就必须检查一下润滑油。(《朗文当代高级英语辞典》，外研社2004年版，p.633)
4.Itis essentialthatyouare surewhatyourgoalsare.你必须明白自己的目标是什么。(《麦克米伦高阶英汉双解词典》，外研社2005年版，p.684)
5.Itisimperativethatthese claimsaredealtwith
‘quickly.这些要求必须尽快解决。(《麦克米伦高阶英汉双解词典*，外研社2005年版，p.1052)
6.It is vital that action is taken quickly.必须迅速采取行动。(《外教社·柯林斯英汉双解学习词典》)
实际是【should+动词原形】但should常省略。故用动词原形
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