Mike is a good student.
Mike单数第三人称,使用相应的be动词is,good是形容词,不用发生变化.
I am a good student.You are a good student.
He always goes home after school.
He单数第三人称,谓语动词go变成相应的goes,always是一个词,副词,不发生变化,跟主语是第几人称没关系.Ich always go home after school.We always go home after school.
所以当主语是单数第三人称的时候,谓语动词部分发生相应的变化,跟副词以及修饰名词的形容词没有关系.