If引导的虚拟语气 (1)-课件(PPT讲稿)

略 if, 并将 were, had 或 should 放到句首。当然, 如果从句没有 were, had, 或 should, 就不能省略 if. If I were to do it, I`d do it some other way. → Were I to do it, I ’ d do it some other way. If you should fail, try again. → Should you fail, try again. If you had been here earlier, you would have seen him. → Had you been here earlier, you would have seen him. I would have bought the house If I had had enough money. →I would have bought the house had I had enough money. ? Note :省略了 if的倒装形式的句首不能用动词的缩略形式。 Were it not for the expense, I would go to Italy. (√) Weren ’ t it for the expense, I would go to Italy. (×) ? But for your help, I couldn ’ t have done it. ? Without electricity human life would be quite different today. 练习:请用介词短语代替条件状语从句 1. 要不是你的帮助,我就失败了。 2. 如果没有恰当的控制手段,核反应堆就会爆炸(核反应堆 nuclear reactor )。