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虚拟语气在主语从句中的应用，主要用于以it作形式主语，that-从句作真正主语的句子中。这种句型的谓语动词的虚拟形式有两种：
1、It+be/seem+(表愿望、建议、命令、要求、意志、惊讶、惶恐、怀疑、不满、遗憾等意义的) 形容词/过去分词/名词+that+subj.+(should)+v.,(有时用should have done)，常见的这类形容词有 advisable, better, crucial, desirable,essential, imperative, incredible,important, queer, preferable,strange, surprising, urgent等；常见的这类过去分词有arranged, desired, ordered, proposed, recommended, requested,required, suggested等。如
It will be better that we should meet some other time. 最好我们另找时间碰头。
It is necessary that a scientific worker (should) know foreign languages. 科学工作者必须精通几种外国语。
It is quite natural that the customs of all national minorities should be respected. 尊重所有少数民族的风俗*惯是十分正常的。
It has been decided that the meeting should be postponed till next Saturday. 已经决定会议延期到下个星期六。
It seems incredible that he should have finished the work so soon. 真使人难以置信，他工作完成的这么快。
2、It is (high) time that +subj.+v-ed该干...事了
It is time that we set to work. 我们该开始工作了。
It is high time that he checked the temperature of the water again. 又该他检查水温的时候了。
该句型中用过去式表示将来，意义为“该干...事了”，时间已经有些晚了。
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