(1) ask,advise,beg,command,demand,decide,desire,insist,order,prefer,propose,require,recommend,request,suggest,urge等表示命令、要求、建议等含义的动词后的宾语从句中,谓语动词用(should)+动词原形,eg.I suggest / suggested that we (should) go tomorrow.名词从句虚拟语气
(2) It is +(形容词/过去分词/特定名词)+that的从句中,形容词主要是表示令人吃惊的、重要的、必要的、关键的等词汇.形容词：astonishing,amazing,advisable,appropriate,crucial,desirable,essential,important,imperative,keen,necessary,natural,normal,odd,proper,preferable,strange,sorry,shocked,surprising,urgent,unusual,vital等.名词从句虚拟语气
(3) 过去分词：decided,desired,demanded,ordered,requested,recommended,suggested等;名词：advice,decision,desire,demand,suggestion,motion,pray,resolution,wish,preference,proposal,recommendation,requirement,idea,order等