白衣-如是
幼苗
共回答了13个问题采纳率：100% 举报
had改为has,这里用完成时,不是过去完成时.
could不代表过去,只表示虚心提问对方
1年前
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各一方
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为什么不能用过去完成时，表他以前走了多长时间
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白衣-如是
那岂不是所有“过去的动作”都要用过去完成时了？ I had answered this question. I had walked for hours. I had read this book. I had finished it. I had used so many "had"s。。。。 过去完成时表示过去的过去，这里用完成时就行了。
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