我给你理清一下：come from = be from,而comes from 是come from 的第三人称单数形式,came from是come from的过去式
come from用于第一人称,第二人称,第三人称复数,比如we,I,they,you等等
comes from用于第三人称单数,比如he,she,it
came from用于过去式
看下例句：
I/We/They/You come from China.
=I am from China/We/They/You are from China.
She/He comes from China.
They came from China.
come from 试用于第一人称和第二人称
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