老外比较拧，一般不会通融的,请个一两天没问题，不过一直不来上课就麻烦了。

不过你可以这样说

Hi, there's a kid who is a graduate studen. He is a working student, so he have to work instead of comming to classes. 如果他就请一两天：He want me to ask you for a leave, it will just be a couple of days. He's afraid that this will hurt his grades when he hit the final. So what do you think of it? I will tell him what you think of it. 如果他就不打算上课了：He won't be comming at all, but he still want his grades when he hit the final. Can you do that? I will tell him what you think of it.