题目内容：

if you really want to know where you destiny is ,look at where you spend you time.分析逗号的用法

优质解答

if you really want to know where you destiny is ,look at where you spend you time.
这是一个由if 引导的条件状语从句,前面是从句,是为了限定条件；后面才是真正要说的话,是主句.所以这就不难理解了吧,前面是从句,后面是主句,主句的主语还是you,只不过前面有了,而且很明确后面为了避免重复就没有再写.