only when the war was over was he able to get back to work?其

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only when the war was over was he able to get back to work?其中为什么会有was,这是什么语法?
类似的还有：the supervisor could have prevented the accident had he known it beforehand.这里为什么会出现had?

嗯,楼上的人说的对,
第二句就是所谓的部分倒装:在虚拟语气中,若非真实条件句省略if,那么必须将主句中的were或had或should等助动词和主语位置颠倒形成的部分倒装.当然这一句中的if意为如果.你只要记住看见助动词提前,且没有句中连词出现,那个说明连词被省略了,而且被省略的连词,必定是if.
第一句你只要记住only还有一些否定的短语象not、only、not、until、never、neither、nor、hardly、little、scarely、seldom等置于句首整句句子一律用部分倒装——助动词提前.

only when the war was over was he able to get back to work?其 Only when the war was over in 1918 was he able to get happil Only when the war was over in 1953 _______ to get back to wo Only when the war was over _ to go back to the village where Only when the war was over ___ to his hometown. Only when the war was over ( )return to his hometowns. A hav He was able to run away before the war broke out.可否将 was abl Question：Only when the work is done ___be able to go back ho Only when the work is done ___be able to go back home.A you only when the work is down______ ________be able to go back 英语翻译1 He was able to leave Europe before the war began.怎么翻译才 He was able to flee Europe before the war broke out.