现在完成时.pptVIP

三）have/has gone to，have/has been to和have/has been in的区别 have/has been in:表示某人“已在某地停留一段时间，现仍在那里”，其后常带表示一段时间的状语。 Tom 在哪儿？ 他去书店买书了。 Where is Tom? He has gone to the bookshop to buy some books. Jack 去过上海两次了 Jack has been to Shanghai twice. 我在北京待了5年了。 I have been in Beijing for 5 years. 四）It is/ has been+段时间+since从句 等于一段时间+has passed+ since从句 eg. 他死了两年了： He died two years ago. He has been dead for two years /since two years ago It is/ has been two years since he died. Two years has passed since he died. * 现在完成时 The Present Perfect Tense 一)构成: have/has+动词过去分词 1.already在现在完成时中的用法 肯定句: 句中(助后实前)/句末 “己经” 一般疑问句: 句末(表示惊讶的语气) “难道” Eg. I’ve already had breakfast. (更常见) = I’ve had breakfast already.(表示强调) Have you had breakfast already? 二)?? 含义: (一)表示过去发生的动作或事情对现在的影响和产生的结果.它强调的是过去的动作同现在的联系.常用的时间状语有already, yet, ever, never, just, before等. 注: 有already的句子在时态上并不都是现在完成时,判断时要看该词后是否有动词的过去分词. Eg. She’s already eighty years old. It was already very late. 2. yet在现在完成时中的用法 否定句:句末 “还(没)” 疑问句: 句末 “己经” Eg. I haven’t had breakfast yet. Have you had breakfast yet? 注: 带already的肯定句变成否定句或疑问句时,将already要变成yet放在句末. Eg. I have already done my homework. 否定句: 一般疑问句: I haven’t done my homework yet. Have you done your homework yet? ? 3. ever在现在完成时中的用法 肯定句/疑问句 : 句中 “曾经” Eg. I’ve ever been to Beijing. Have you ever been to Beijing? 4. never在现在完成时中的用法 否定句: 句中 “从来没有” Eg. I’ve never been to Beijing. 注: 带ever的肯定句变否定句时, 要将ever变成never; 带ever的一般疑问句作否定回答时可用“No, never.” Eg. He has ever made dumplings. 否定句: Have they ever travelled by train? No, never. He has never made dumplings. 5. just在现在完成时中的用法 用于句中, 表示“刚刚” Eg. I’ve just had breakfast. What have they just done? 6. before在现在完成时中的用法 用于句末, 表示“以前” Eg. I’ve seen it before. Has she ridden a bike before ? ? (二)表示一个从过去开始,一直持续到现在,有可能继续下去的动作或状态.通常和for或since引导的时间状语连用. 1.for + Eg. I have been here for 5 weeks. He’s studied English for 3 years. 一段时间 2. since + 从句(一般过去时) ? ? 单词 词组 (表示过去某