either 是指两个人其中一个（单数）,所以应该用is right.还要注意就是,既然用is,就得把you放在前面,he放在后面,不然you和is就在一块儿了.最后应该是：
Either you or he is right.(Either you are right,or he is right.)
要吗你对,要吗他对.
记住这几个：
I am right.
You are right.
He is right.
We are right.
They are right.