现在完成时和过去完成时有什么区别求大神帮助
\u82f1\u8bed\u4e2d\uff0c\u4e00\u822c\u8fc7\u53bb\u65f6\u3001\u73b0\u5728\u5b8c\u6210\u65f6\u3001\u8fc7\u53bb\u5b8c\u6210\u65f6\u6709\u4ec0\u4e48\u533a\u522b\uff1f\u62dc\u6258\u5404\u4f4d\u5927\u795e1.\u4e00\u822c\u8fc7\u53bb\u65f6\u8868\u793a\u7684\u662f (1)\u8fc7\u53bb\u53d1\u751f\u7684\u52a8\u4f5c I had lunch yesterday.\u6211\u6628\u5929\u5403\u8fc7\u5348\u996d. (2)\u8fc7\u53bb\u7684\u72b6\u6001 I was ten in 1990.1990\u5e74\u6211\u5341\u5c81. 2.\u73b0\u5728\u5b8c\u6210\u65f6\u8868\u793a\u7684\u662f (1)\u52a8\u4f5c\u53d1\u751f\u5728\u8fc7\u53bb,\u73b0\u5728\u521a\u521a\u5b8c\u6210. I have jast had lunch.\u6211\u521a\u521a\u5403\u8fc7\u5348\u996d. (2)\u52a8\u4f5c\u53d1\u751f\u5728\u8fc7\u53bb,\u5bf9\u73b0\u5728\u6709\u5f71\u54cd. I have already had lunch.\u6211\u5403\u8fc7\u5348\u996d\u4e86.(\u610f\u601d\u662f\u6211\u4e0d\u997f\u4e86) (3)\u52a8\u4f5c\u53d1\u751f\u5728\u8fc7\u53bb,\u5230\u73b0\u5728\u8fd8\u6ca1\u7ed3\u675f. He has lived here for 20 years.\u4ed6\u4f4f\u5728\u8fd9\u91cc\u5df2\u7ecf20\u5e74\u4e86. 3.\u8fc7\u53bb\u5b8c\u6210\u65f6\u662f\u6307\u52a8\u4f5c\u53d1\u751f\u5728\u8fc7\u53bb\u7684\u8fc7\u53bb. Before he came back,I had already finished the work.\u4ed6\u56de\u6765\u4e4b\u524d,\u6211\u5df2\u7ecf\u5b8c\u6210\u4e86\u5de5\u4f5c.("Before he came back"\u662f\u8fc7\u53bb\u7684\u4e8b\u60c5," I had alreday finished the work"\u53d1\u751f\u5728\u8fd9\u4e4b\u524d,\u6240\u4ee5\u53eb\u8fc7\u53bb\u7684\u8fc7\u53bb.
\u73b0\u5728\u5b8c\u6210\u65f6\u7528\u4e8e\u5df2\u7ecf\u5b8c\u6210\u7684\u4e8b\uff0c\u5f3a\u8c03\u5bf9\u73b0\u5728\u7684\u5f71\u54cd\u3002 \u8fc7\u53bb\u5b8c\u6210\u65f6\u7528\u4e8e\u8fc7\u53bb\u5c31\u5b8c\u6210\u4e86\u7684\u4e8b\uff0c\u5f3a\u8c03\u5bf9\u8fc7\u53bb\u7684\u5f71\u54cd\u3002 \u6bd4\u5982\uff1aHe can not go out because he has not finished his homework yet . He says that he had not finished his homework so he could not go out. \u4e0d\u61c2\u5f97\u6b22\u8fce\u7ee7\u7eed\u8be2\u95ee~ ~\u5c0a\u91cd\u539f\u521b\uff0c\u8c22\u8c22\u91c7\u7eb3~
现在完成时（标志词have/has+动词的过去分词）是到目前为止已经完成或正在持续的动作，并且这个动作的结果对现在产生了影响。 过去完成时（标志词had+动词的过去分词, 是到过去的某一时间已经完成或正在持续的动作，并且这个动作的结果对过去的这一时间产生了影响。 区别：现在完成时的基准时间（也就是上面说的“目前”）成为了过去就成了过去完成时了。从定义上来讲的话， 现在完成时是指过去做过，对现在还有影响的事 过去式指单纯过去做了的事。 现在完成时常与ever , already ， yet , still ,for .since连用 当与for , since连用时， 句子里的谓动要用延续性动词 还有就是，当句子中有明显的过去时间状语，就一定要用过去式 e.g : I did some shopping yesterday afternoon. 而不能说 I have done some shopping yesterday afternoon.
have down 是现在完成 （他吃饭了） had down是过去完成（我回来的时候，他就已经吃过了） 能理解吗
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绛旓細杩囧幓瀹屾垚鏃朵笌鐜板湪瀹屾垚鏃剁殑鍖哄埆锛1銆佽繃鍘诲畬鎴愭椂鐨勫姩浣滃彂鐢熷湪杩囧幓锛屼絾鏄椂闂村弬鐓х偣鏄繃鍘荤殑鏌愪竴鏃堕棿銆2銆佺幇鍦ㄥ畬鎴愭椂鐨勫姩浣滃彂鐢熷湪杩囧幓锛屼絾鏄椂闂村弬鐓х偣鏄幇鍦ㄣ備緥鍙ワ細1.I have lived in Thailand for five years. (鎴戠洰鍓嶅湪娉板浗宸茬粡浣忎簡浜斿勾浜)銆...
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