come,came还是have come?

come,came还是have come? hane come 和 have came They have come.怎么不是came his dream has come true.是come 还是came keep calm when problem come along用come还是came came和come是什么意思 you have just come back your hometown为什么不用came have/has 后为什么是come 而不是 came ? "have come he was seen--into the room .这个空 因该是 came 还是 come 还是 to come they---here once in the past .a,came b,have come .c has come I didn't know you had come back 中的had come 不该用have came back