求分析下~这个句子的~句式~成分~结构
问题描述：
求分析下~这个句子的~句式~成分~结构
It's almost impossible not to wonder if maybe,at some point in the distant past,our rocky neighbor once supported life.(来自一篇天文学关于火星的文章)
答
It's almost impossible not to wonder if maybe,at some point in the distant past,our rocky neighbor once supported life.It 形式主语,真正的主语是后面的不定式not to wonder,为平衡句子结构,不至于显得头重脚...