不行.may和would都是情态动词,重复了,be和crash都是动词,绝不能这么用.seem本来就是联系动词,与be动词功能几乎一样；这个句型是没问题,关键是按这句子的含义（设想飞机失事）,不能套这句型.
it seemed certain that their plane would crash
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