i am teacher 和i am a teacher.的说法那个是对的?如果不对,为什么一定要加冠词a?

I am a teacher的否定形式 I am a teacher 变为一般疑问句 I am a teacher.(改为复数) Jack or I am a teacher是什么意思 I am a teacher 一般过去时：一般疑问句： I am a teacher 变为否定句 i am a teacher 改为疑问句 英语I am a teacher前一句是什么 IF I AM A TEACHER对吗?是WERE还是AM? I am a teacher,_______?的反意疑问句后面应该接什么~比如I am not a teacher ,am I 那么I am a teacher Are you a teacher?Yes,I'am.Are you a teacher?Yes,I'am. I am a teacher.中,I主语,am谓语,teacher表语,a是什么成分? I am so good a teacher还是I am a so good teacher?哪一个正确?为什么? I am a teacher.划线部分提问teacher划线 I teach lessons.I am a teacher.中文翻译 I am a teacher.I like bai du wen ku . I am ok.I am a student.I am Gina Green.She is my teacher.一般疑问句怎么改? I am a teacher.what is your j什么 i am a reproter填空