i am from 和 i come from 为什么i come from 没有助动词呀?

i am from 和 i come from 为什么i come from 没有助动词呀? I come from China和 I am from China意思一样吗 I am from chongqing和I come from Chongqing改一般疑问句 特殊疑问句 I am/come from 还是I was/came from? 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? 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 am from I come from china.可以说I am from china.为什么这里不加be动词am了?