初中现在完成时练习精品课件.ppt

现在完成时 现在完成时: have/ has +过去分词 1) 表示到现在为止已经完成或刚刚完成的动作。 Now we have planted all the trees. He has just come back. 2) 表示过去发生的动作, 但强调结果或对现在的影响。 Have you had your supper? I have read the book twice already. 在以上两种用法中常跟already, not…yet, never, just, before, ever, recently等时间继续下去的状语。 3) 表示过去已经开始, 持续到现在, 也许还会继续下去的动作或状态，常与包括现在在内的一段时间的状语连用。 He has studied English for 6 years. Mary has been busy since she came back from Hangzhou.. 过去分词的构成 1.直接加-ed。如：play-played 2.以字母e结尾的直接加d 。如：name-named 3.以辅音字母加y结尾的，变y为i加ed。如：carry-carried 4.重读闭音节且末尾只有一个辅音字母，双写这个辅音字母再加-ed。如：stop-stopped 现在完成时 Present perfect 句型 1.肯定句 现在完成时的肯定句式是“have（has）＋过去分词”。 注意：该句式中的have或has是助动词，has用于第三人称单数，其它人称一律用have。 2.疑问句 　　现在完成时的一般疑问句式是把助动词have或has提到主语之前。 （回答用“Yes，．．．have（has）．／“No，．．．haven’t（hasn’t）．” ） 3.否定句：现在完成时的否定句式是“havent（hasnt）＋过去分词”。 I’ve already had dinner. I ________ ________ dinner ________. 2. He has just finished his homework. He ________ ________ his homework _________. 3. Mum’s cooked the dinner. Mum _______ ________ the dinner. 4. Susan’s learned English at school. Susan ________ ________ English at school. haven’t had yet hasn’t finished yet hasn’t cooked hasn’t learned 把下列句子改为否定句 I’ve already had dinner. 2. He has just finished his homework. 3. Mum’s cooked the dinner. 4. Susan’s learned English at school. Have you already had dinner? Has he just finished his homework? Has mum cooked the dinner? Has Susan learned English at school? 把下列句子改为一般疑问句 分清与一般过去时的用法 现在完成时属于现在时态的范围，不能和表示过去的时间状语连用，如yesterday,last night,three weeks ago,in1990等.而一般过去时只表示过去的动作或状态，和现在不发生关系。 eg--- I have seen the film. eg--- I saw the film last week. eg--- He has lived here since 1993. eg---- He lived here in 1993. Notes: 1) have gone to 与have been to have gone to表示某人已离开了原地，去了另外某地，说话时，人已不在原地。后者表示某人曾 have been to去过某地，说话时人已不在某地了。 He has been to Xi‘an twice. 他曾经去过西安两次。（已经回来了） You can’t find him. He has gone to Xian. 你找不到他。他去西安了。（没回来） 动词填空： 1._____ you ________(cle