“what are you up to ”和“what are you up for ”的区别是什么?

what are you up to ” 询问别人最近如何.或“你(做事)做到什么地方了”.如功课做得差不多了吗?见例句：
What Are You Up To These Days
what are you up for 除了上面类似的意思外,
还有下面的意思：what are you up for tonight?即问具体的打算.此外,还有：
So what are you up for if you are more interested in trying a talking therapy approach with a psychologist?
what are you up to 较常见

what are you up to ?” 询问别人的职业
what are you up for ?”你起来干嘛？？（WHAT 。。。 FOR =WHY）
供参考

what are you up to ? 你现在想作什麼?
what are you up for ? 你将会如何