(误)It is important that he will do it.
(正)It is important that he do it.(It is important+that引导的名词从句的动词要用should加原形动词，should可以省略。)
(误)Be she a man，she might be elected president.
(正)Were she a man，she might be elected president.(表示与现在事实相反的虚拟语气，不能用was，只能用were;若省略if，则将were放在句首。)
(误)If my father were here now，he will tell me what to do.
(正)If my father were here now，he would tell me what to do.(表示与现在事实相反的虚拟语气中，主句的助动词只能用would，might等过去时。)
(误)I shouldn't do that if I was you.
(正)I shouldn't do that if I were you.(表示与现在事实相反的虚拟语气不能用was，只能用were.)
(误)If it had not rained yesterday，he might come.
(正)If it had not rained yesterday，he might have come.(表示与过去事实相反的虚拟语气中，主句的动词要用助动词的过去时might，could等+HAVE+过去分词。)
(误)Did he bring some money with him，he would have bought it.
(正)Had he brought some money with him，he would have bought it.(表示与过去事实相反的虚拟语气中，条件从句的动词要用过去完成时，若省略if，则用倒装形式。)
(误)If I knew her telephone number，I would have called her.
(正)If I had known her telephone number，I would have called her.(表示与过去事实相反的虚拟语气中，条件从句的动词要用过去完成时。)
(误)I suggested that the teachers'wages could be increased.
(正)I suggested that the teachers'wages should be increased.(suggest当建议讲时，后面的名词从句的主要动词要用should加原形动词，should可以省略。)
(误)I don't think that I shall fail.But if I failed，I would try again.
(正)I don't think that I shall fail.But if I should fail，I would try again.(表示与将来事实相反的虚拟语气中，条件从句的动词用should加原形动词。)
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