I am/come from 还是I was/came from?

I am/come from 还是I was/came from? I come from ____ .I am an ____.应该选England；English还是America；American i am from 和 i come from 为什么i come from 没有助动词呀? I come from America.i come from America.I am from America,I am an American.有什么区别? i come from china i后面还加am吗 I am Leo come from China.I am Leo from China.哪个正确? 我来自中国,这句话用英语怎么说?在线等如题到底是 I am from China. 还是I come from China. 呢快急用，谢谢~~还是I am come from China. l come back还是i am come back you,he and I [are/is/come/am] from china i am come from xiangtan.a city of hunan I am just come back from you I am just come back from you dream 我不懂 I am come back. where do you come from?a I come from school.b.I am from china.选哪个? who am where I come from?and what I am doing?有语法错误吗 I come from I come from Greece I come from thailand I come from China和 I am from China意思一样吗