请高手语法分析下,连词while用的是否正确?
问题描述：
请高手语法分析下,连词while用的是否正确?
While usually thought to end in northern New Mexico,the Rocky Mountain really extend southward to the frontier of Mexico.
答
是个从句省略的形式宾语的句子即省去“it is",while表转折,“尽管”.整句是“While it is usually thought to end in northern New Mexico,the Rocky Mountain really extend southward to the frontier of Mexico”