题目内容：

求 一句话 语法分析
it's just as important to fight for sth as it is to fight against sth.
我感觉正常的语序是 to fight for sth is just as important as to fight against sth.
但是 多出来的 it is 是怎么回事?求指教
我是指 to fight against sth 前边的 it is