I am home 和I am at home哪个对

I am home 和I am at home哪个对 i go home 还是i am go home 哪个对 I am at home now. He is not at home 和 he is not home 一样意思吗,那么 i am home 和 I am I am at home=I am in吗如图,3 I am stay at home 为什么错误 请翻译 I am helpful at home I am at home （ ）my father. Am i doing my homework at home? I AM GO HOME I am home可不可以改成I at home或I‘m at home I am at home ,am 可不可以去掉,说出为什么?