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(3)but that也用来引导虚拟语气。 But that her family were badly off, she would have finished her university education.要不是她家很穷，她会完成大学教育的。 If it were not for the Internet, we could not be living a much easier life today. 要是没有因特网，我们现在不可能过着一种更容易的生活。(与现在事实相反) If it had not been for your instructions, we wouldn’t have completed the task ahead of time. 要不是你的指导，我们就不可能提前完成这项任务。(与过去事实相反) 3.If it were/had been not for...句型中的虚拟语气 4.虚拟语气还可用来表示祝愿、禁止等 Long live the friendship！友谊万岁！ May you succeed！祝你成功！ God bless you！上帝保佑你！ otherwise/or构成的含蓄虚拟语气，主句用陈述语气，从句用虚拟语气；but构成的含蓄虚拟语气，主句用虚拟语气，而but从句用陈述语气。 4.If Mr.Dewey________(be) present, he would have offered any possible assistance to the people there. 答案 had been [与过去事实相反的虚拟语气，条件状语从句要使用had done，主句要使用“情态动词＋have done”。根据本句后面主句中的would have offered说明与过去事实相反可知，从句中使用过去完成时。] 易错点1 情态动词＋have done结构的误用 用括号内动词的适当形式填空 What a pity! Considering his ability and experience, he ________(do) better. 解析 句意：真是遗憾！考虑到他的能力和经验，他当时有可能做的更好些。 答案 might have done | 
