I have just come back from USA,这句为什么不用came?

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I have just come back from USA,这句为什么不用came?
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I have just come back from USA,这句为什么不用came?
I have just come back from USA,这句为什么不用came?

I have just come back from USA,这句为什么不用came?
这是一个现在完成时,其构成是have/has + 动词过去分词.
而come(原形动词)--came（过去时）---come（过去分词）
所以本句要用come.
如果用came,就要去掉have,用的就是一般过去时了.

have come come 的过去分词是 come

come是过去分词

现在时 过去时 过去分词 come came come 这句come用过去分词形式

Just后面要用原型。 即使是过去式也要改过来。

这句是现在完成时。要用现在分词，come的现在分词就是come不变。

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