I am/come from 还是I was/came from?

I am/come from 还是I was/came from? I came from china还是I come from china? i am from 和 i come from 为什么i come from 没有助动词呀? I am just come back from you where do you come from?a I come from school.b.I am from chin 求讲解短文 .比如 ：I came from Shenzhen .解析：come from 来自=be from .就是 I come from ____ .I am an ____.应该选England；English还是America；A Where are you from 我写的是：I come from germany I am from german i come from china i后面还加am吗 I come from I come from thailand I come from America.