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 hadnt 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 couldnt 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。

　　句型38

　　在动词insist(1坚持做某事)，order, command(2命令), advise, suggest, propose(3建议做某事)，demand, require, request, ask(4要求)等表示建议、命令、要求的名词性从句中谓语动词要用虚拟语气。基本句型：主语+ (should) + 动词原形。另外像decide, desire, intend, recommend等也要接(should)+动词原形结构。

　　[例句]

　　Mother insists that Tom (should) go to bed at nine oclock.(宾语从句)

　　We suggested that the meeting (should) be held at once.

　　It was required that the crops (should) be harvested at once.(主语从句)

　　The suggestion that he (should) be invited was rejected.(同位语从句)

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