I have just come back from USA,这句为什么不用came?
来源:百度知道 编辑:UC知道 时间:2024/09/28 13:16:08
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。
Just后面要用原型。
即使是过去式也要改过来。
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
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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