I've come to bid you farewell.和I come to bid you farewell.的区别完成时态和现在时有什么区别吗?

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I've come to bid you farewell.和I come to bid you farewell.的区别完成时态和现在时有什么区别吗?

I've come to bid you farewell.和I come to bid you farewell.的区别完成时态和现在时有什么区别吗?
I've come to bid you farewell.和I come to bid you farewell.的区别
完成时态和现在时有什么区别吗?

I've come to bid you farewell.和I come to bid you farewell.的区别完成时态和现在时有什么区别吗?
i've是指已经发生了的
I come to bid you farewell则是普通句,没之前也没之后.如果要答应对方就把句子转成未来式,可以这样 i will come.懂吗?