i am a teacher 改成第三人称单数一般现在时,成了she is a teacher 这是对的吗?

i am a teacher 改成第三人称单数一般现在时,成了she is a teacher 这是对的吗? i am teacher 和i am a teacher.的说法那个是对的? she is a teacher 改成否定句 I am a teacher.这句话a teacher是表语还是teacher是表语 改成一般疑问句I am a teacher.I like English.My mother is a doctor.M Is she a teacher Is she a teacher? she is a teacher she is a teacher. she herself is a teacher 这个句子是对的吗?herself具体是什么意思! i think she is a teacher I am ok.I am a student.I am Gina Green.She is my teacher.一般疑