句型35if only引起的感叹句，相当于 "How I wish + 宾语从句"，意思是"但愿……;要是……就好了" [例句] If only he could come! 他要是能来就好了! If only we students didn't have so much homework!要是没有这么多的作业该多好! If only I hadn't been so careless in the exam! 我当时没有那么粗心就好了!

　　句型36　   if it were not for… (= were it not for…)                   if it hadn't been for… (= had it not been for…)"要不是因为有……;如果不是……" [注意]这种结构中不能用否定结构的缩写形式，即不能用weren't it for…) [例句] If it hadn't been for (= Had it not been for) the determined captain, all the passengers on board wouldn't have been saved. 要不是船长一直坚强，船上的旅客就不会得救。 If it were not for your rich parents, you couldn't live so easy a life. 要不是你父母有钱，你的生活不会如此安逸。 If it were not for the expense, I would go abroad now. 如果不是因为经费问题，我现在就出国了。

　　句型37"but for + 名词"和"but that +从句"，意思是"倘若不是;要不是"，接虚拟语气 [例句] But for air and water, nothing could live. (= If there were no air or water, nothing could live.) 如果没有空气和水，什么东西都难以生存。 But for the storm, we should have arrived earlier. = If it hadn't been for the storm, we should have arrived earlier. 如果不是暴风雨，我们早就到了。 But for you, we couldn't have carried out the plan. 要不是你的话，我们无法实施那项计划。 She could not have believed it but that she saw it. 若非亲眼所见，她是不会相信的。

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