是

好的，首先我们需要定义 Person 类，其中包含一个成员变量姓名(name)：

public class Person {
    String name;

    public Person(String name) {
        this.name = name;
    }
}

接下来是 Teacher 类，它继承自 Person 类，并添加了一个姓(surname)的成员变量和 teach() 方法：

public class Teacher extends Person {
    String surname;

    public Teacher(String surname, String name) {
        super(name);
        this.surname = surname;
    }

    public void teach() {
        System.out.println("年龄为80岁的" + surname + name + "正在讲课");
    }
}

最后是 Student 类，它也继承自 Person 类，并添加了年龄(age)和成绩(score)两个成员变量以及 study() 方法：

public class Student extends Person {
    int age;
    double score;

    public Student(String name, int age, double score) {
        super(name);
        this.age = age;
        this.score = score;
    }

    public void study() {
        System.out.println(name + "正在学习");
    }
}

这样就完成了三个类的定义。可以根据需要创建对象并调用对应的方法，例如：

Teacher teacher = new Teacher("张", "三");
teacher.teach();

Student student = new Student("李四", 18, 90.5);
student.study();