要看具体语境. 　　Itis/was＋adj./n.＋that主语从句多数情况下用虚拟语气,表达一种要求,命令或者责备,建议,或主观看法.that从句用“should+do,英国英语可以省略should”e.g.Itisimportantthathe(should)gotoschool. 　　但是如果只是表示陈述一个事实而不是强烈的感情,完全可以用一般的陈述语气. 　　Itisstrangethathehadmadeamistake.（陈述一个事实：他犯了错误让人有点奇怪.） 　　Itisstrangethathe(should)havemadeamistake.（虚拟语气,说话者是在责备他本不应该犯错.） 　　e.g.Itisashamethattherainspoiledourpicnic.Itisapity(that)helostsomuchmoney.Hewasaverybravemananditissurprisingthathelivedsolong.Itisstrangethatnobodyknowswherehelives. 　　特别注意that从句谓语动词用“(should)+动词原形”的情况： 　　1."Itisimportant(necessary,strange,impossible,natural)that." 　　e.g.It'snecessarythatweshouldhaveawalknow.It'snaturalthatsheshoulddoso.It'simportantthatweshouldtakegoodcareofthepatient. 　　2."Itisapity(ashame,nowonder,better)that." 　　e.g.Itwasagreatpitythatyou(should)havemadesomanymistakesinyourmathexercise.Itwillbebetterthatshestaywithhergrandmother. 　　3."Itissuggested(requested,proposed,ordered)that." 　　e.g.ItwassuggestedthatthesportsmeetbeputoffuntilnextSaturday.Itisdesiredthatwe(should)geteverythingreadybytonight.Itwasorderedthatthemedicinebesenttherebyplane.