过去完成时,现在完成进行时的区别
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\u533a\u522b\uff1a\u524d\u8005\u8868\u793a\u5ef6\u7eed\u81f3\u8fc7\u53bb\u67d0\u65f6\uff1b\u540e\u8005\u8868\u793a\u5ef6\u7eed\u81f3\u73b0\u5728\u3002I had never known what was sorrow before my dad was dead at the age of 14.
Have you ever been to the Great Wall\uff1f
\u73b0\u5728\u5b8c\u6210\u65f6\u6001\u6709\u4e24\u79cd\u7528\u6cd5\uff0c\u4e00\u79cd\u662f\u8fc7\u53bb\u53d1\u751f\u7684\u52a8\u4f5c\u5bf9\u73b0\u5728\u9020\u6210\u7684\u5f71\u54cd\uff0c\u53e6\u4e00\u79cd\u662f\u8fc7\u53bb\u53d1\u751f\u7684\u52a8\u4f5c\u53d1\u751f\u5230\u73b0\u5728\uff0c\u5e76\u6709\u53ef\u80fd\u6301\u7eed\u4e0b\u53bb\u3002\u3000\u3000\u73b0\u5728\u5b8c\u6210\u65f6\u6001\u8868\u793a\u8fc7\u53bb\u7684\u8fc7\u53bb\uff0c\u5373\u5728\u8fc7\u53bb\u7684\u65f6\u95f4\u70b9\u4e4b\u524d\u53d1\u751f\u7684\u52a8\u4f5c\u3002\u4f8b\u5982\uff1aBefore I came home\uff0che had finished his work. \u5728\u6211\u5230\u5bb6\u4e4b\u524d\uff0c\u4ed6\u5df2\u7ecf\u505a\u5b8c\u4e86\u5de5\u4f5c\u3002\u8fd9\u53e5\u5c31\u5fc5\u987b\u7528\u8fc7\u53bb\u5b8c\u6210\u65f6\u6001\uff0c\u56e0\u4e3aI came home\u662f\u8fc7\u53bb\u53d1\u751f\u7684\u52a8\u4f5c\uff0c\u8fc7\u53bb\u7684\u52a8\u4f5c\u4e4b\u524d\uff0c\u5c31\u662f\u4ed6\u5b8c\u6210\u5de5\u4f5c\uff0c\u6240\u4ee5\u662f\u8fc7\u53bb\u7684\u8fc7\u53bb\uff0c\u8fc7\u53bb\u5b8c\u6210\u65f6\u6001\uff0c\u800c\u73b0\u5728\u5b8c\u6210\u65f6\u6001\u4e2d\u662f\u7edd\u5bf9\u4e0d\u5141\u8bb8\u51fa\u73b0\u8fc7\u53bb\u7684\u65f6\u95f4\u72b6\u8bed\u7684\u3002
“过去完成时”强调对过去的影响，发生在“过去的过去；“现在完成时”则强调对现在的影响，由过去某一时间开始并一直持续到现在的动作或状态。过去完成时表示在过去某一时间或动作之前已经发生或完成了的动作或状态。它表示句子中描述的动作发生在“过去的过去”。
现在完成时是说过去发生并且已经完成的动作对现在造成影响或后果，过去某一时间开始并一直持续到现在的动作或状态。
现在完成时是对于现在而言某件事情或某个动作已经完成，而过去完成时是对于过去的某个时间点而言某件事情或某个动作已经完成，两者的时间参照点不同，结合具体语境便可分析出到底使用哪个合适。
过去完成时，是相对与过去的一个时间点，某件事情就已经完成。
现在完成时，是相对与现在的时间点，某件事已经完成。
所针对的时间点不一样。比方说：我五年前就学会了骑车。就是用过去完成时。如果是我（现在）学会了骑车。那就用现在完成时。
你可以看看http://www.examda.com/cet4/Guide/20070402/142738381.html
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