疑问句把谓语is提前,这是英语语法规定的.
is he a teacher这句就是疑问句he is a teacher他是一名老师,陈述句.Ӣ��ΪʲôҪ��ô�涨�أ��﷨����ϰ���÷���������ϰ�߳ɹ��