虚拟语气,对现在情况的假设,主句 用would +动词原形,从句用过去式或should+动词原形
if从句省略if,should提前
正常语序
if all the cultural differences between hosts and guests should be eliminated,i would be hard-pressed to imagine how much pleasure and excitement tourism can afford us
如果主客之间的所有文化差异被消除,
我很难想象,旅游业还能给能我们带来多少乐趣和兴奋．
how much pleasure and excitement tourism can afford us 这个是感叹句
正常语序是 tourism can afford us much pleasure and excitement