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问题: 虚拟语气倒装的问题

虚拟语气中if 从句可以省略 if把谓语动词提前倒装, 如果从句谓语动词后有否定词not 或其他否定词,该如何倒装,否定词放在什么位置. (好象平时看到的只有肯定句倒装形式,没看到过有否定的形式.)
如:were he in town , he would visit us.

解答:

只将were /should /had...等提在句首,not放在原位置:
Had it not been for your help, we could have finished it on time.
Should it not rain tomorrow, we woul go outing.