Why is "came from" not "come from"? Several days ago,when I listened "Words and expressions",a programme in Special English by VOA ,I listened a sentence like this"It is surprising how mant expressions that Americans use every day came from the card game of poker".Where the words "came from" is used in this sentence .In the beginning I thought I listened wrongly, so I listened this sentence again and again,but it was still"came from",then I saw the text,it was "came from" indeed. So I don't know why is "came from" not "come from" here. I would appreciate it if anyone could explain it! By the way ,I am learning English now and my English is not good,so you can correct this composition while you explain the question above.