"I am teacher"中"am"和"Yes,I am"中"am"的词性?

"I am teacher"中"am"和"Yes,I am"中"am"的词性? I am back home 中”back"和"home"的词性 I am writing中am的作用 Are you a teacher?Yes,I'am. 德语 yes,I am Yes,I am.No,am not. "I am a teacher."中,"I"主语,"am"谓语,"teacher"表语,"a"是什么成分? i am what i am和 i am who i am的区别 i am teacher 和i am a teacher.的说法那个是对的? I am very well 中very的词性和在句中的成分. Yes,I am.{变复数} what am yes,I'm( ).