unit现在完成时态.pptVIP

不规则动词的过去分词 Feel leave tell sell say lay begin fall fly forget take wear write * 现在完成时态 定义：现在完成时态是一个把过去和现在联系起来的时态．用与描述过去某一时间发生，其结果对现在仍有影响的时间． 过去发生的动作　　　　　　　　　　　　　　（可能结束，也可能仍在继续） 现在 一、现在完成时的构成现在完成时的肯定句句型 主语（I/we/they/you）+ 主语（he/she/it) + +过去分词 have has We have lived in Beijing. He has lived in Beijing. I have finished my homework. 现在完成时的否定句 主语＋have/has + not + 过去分词 +… I haven’t been to Shanghai. I have not seen the movie yet. 现在完成时的疑问句 Have/ has +　主语＋过去分词＋…？ Have you finished the work? Yes, I have. No, I haven’t. Has she arrived here? 三式相同 cost cut hit hurt set put shut read A----A------A The table below shows how we form the past particles of some verbs. learned learn moved move landed land missed miss lived live visited visit traveled travel Past particle Infinitive 　　most regular verbs bring buy think teach catch brought bought thought taught caught brought bought thought taught caught felt left told sold said laid felt left told sold said laid come become run came became ran come become run began fell flew forgot took wore wrote begun fallen flown forgotten taken worn written A---B---C 现在完成时的用法  结束，结果：表示现在刚完成的动作； 继续：表示过去继续到现在的动作或状态； 经验：表示过去某时到现在的经验 影响性用法 持续性用法 1.现在完成时用来表示现在之前已发生过或 完成的动作或状态,但其结果却和现在有联系. I’ve lost my passport. I’ve finished my work now. I have forgotten her telephone number. 常与just, already, yet, now ,ever, never 等时间状语连用 a.?用副词already和yet。already一般用于肯定句中，yet一般用于否定句和?疑问句中 eg.: We?have?already?finished?our?homework. Have you finished your homework yet? They?havent?finished?their?homework?yet.  b.用ever?和never。多用于否定或疑问句中，表示“曾经”或“从未“等。?? eg.：Have?you?ever?been?to?the?Great?Wall ? 你曾经去过长城吗？ I have never heard of him. (2)用来表示发生在过去某一时刻的,一直持续到现在的情况 Mary has been ill for three days.  I have lived here since 1998.  We have known each other since I was a l