请帮忙分析下句子结构If you're a visual learner,chances are you did wel

请帮忙分析下句子结构If you're a visual learner,chances are you did well on spelling tests,and so you have a sense of the rightness of spelling.其中chances are you did well应该怎么看待,是主系表结构吗,you did做什么成分啊?