这一类型主要包括It?is?(was)?important?(necessary,?desirable,?imperative,?advisable)that.?.?.句型。如：
It?is?impossible?that?he?should?go?home.?他不可能会回家去。
It?is?necessary?that?I?should?return?it?right?now.?我有必要马上把它还回去。
It?is?important?that?we?should?speah?politely.?我们说话要有礼貌，这是很重要的。
It?is?not?necessary?that?everyone?be?a?scientist.?没有必要使每一个人都成为科学家。
It?is?imperative?that?we?should?practise?critidsm?and?self-criticism.?应当进行批评与自我批评。
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二、It"s?a?pity…类
It?is?a?pity?that?she?should?fare?so?badly.?她竟吃得这么差，真可怜。
It"s?a?pity?that?he?should?be?so?obstinate.?真遗憾他竟这样倔犟。
It?was?a?pity?that?you?couldn"t?come.?你不能来，真是太遗憾了。
It?is?a?pity?that?she?failed?the?driving?examination.?她没通过驾驶考试真是遗憾。
It?is?his?desire?that?a?medical?man?should?stay?here.?他希望有一个医务人员留在这里。
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三、It"s?desired…类
这种主语从句还常用在It?is?(was)?desired?(suggested,?settled,?proposed,?requested,?decided,?etc.?)?that...句型。如：
It?is?requested?that?a?vote?be?taken.?建议付诸表决。
It?is?settled?that?you?leave?us,?then??那么你肯定要离开我们罗?
It?was?proposed?that?this?matter?be?considered?at?the?next?meeting.?有人提议这事下次会议再讨论。
It?is?desired?that?this?rule?should?be?brought?to?the?attention?of?the?staff.?希望这条规则引起全体职员的注意。
注意：
(1)?在现代英语中，有时也可不用虚拟语气而用陈述语气，但初学者宜慎用。
(2)?在It?is?amazing?(strange,?surprising,?astonishing,?a?pity,?a?shame)以及?I?am?surprised?(sorry)?和I?regret等结构后的that?从句中有时也用should，表示说话人的惊异、懊悔、失望等情感，常含有“竟然”之意：
It"s?strange?that?he?should?be?so?rude.?他竟如此无礼，真是奇怪。
I"m?surprised?that?he?should?have?failed.?他竟然失败了，这使我很吃惊。
若不用虚拟语气也可以，则不带感情?色彩，比较：
It"s?a?pity?that?he?failed?the?exam.?他考试没及格，真是遗憾。
It"s?a?pity?that?he?should?have?failed?the?exam.?他考试竟没及格，真是遗憾。
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