so与for是并列连词还是从属连词,

并列连词用来连接平行的词、词组和分句.如：and,but,or,nor,so,therefore,yet,however,for,hence,as well as,both…and,not only…but also,either…or,neither…nor,(and)then等等.从属连词有 after,although,as,be...