Yes,I had been to the U.S.once before.和 yes,I have been to the U.S.once 一个意思?

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Yes,I had been to the U.S.once before.和 yes,I have been to the U.S.once 一个意思?

Yes,I had been to the U.S.once before.和 yes,I have been to the U.S.once 一个意思?
Yes,I had been to the U.S.once before.和 yes,I have been to the U.S.once 一个意思?

Yes,I had been to the U.S.once before.和 yes,I have been to the U.S.once 一个意思?
第一句是过去完成时,表示到过去某个时间已完成的动作.用在这个场合不正确.
第二句是现在完成时,表示到现在已完成的动作.用在这里正确.
第二句不能改成yes, i have went to the u.s once?因为went不是过去分词,只是过去式.如果写成
Yes, I have gone to the U S once.也不对.因为句中的副词once曾经,有了这个词句子表示去过.要用have been才是去过.而have gone表示已经去了,在路上还没回来.

不是同一个意思。
第一句:是的,我以前去过一次美国。(指过去,与现在没有关系,用的是过去完成时)
第二句:是的,我曾经去过一次没过。(指对现在造成的影响还存在,用的是现在完成时)第2句改成 yes, i have went to the u.s once? 意思就一样了吗...

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不是同一个意思。
第一句:是的,我以前去过一次美国。(指过去,与现在没有关系,用的是过去完成时)
第二句:是的,我曾经去过一次没过。(指对现在造成的影响还存在,用的是现在完成时)

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