江苏省东台市唐洋镇中学八年级英语下册《Unit 1 Past and present Grammar(Ⅰ)》学案（无答案） 牛津版.doc

unit 1 past and present grammar()学案【学习目标】1.to know the present perfect tense.2.to master the structure of the ppt. 3.to learn the differences between the simple past tense and the present perfect tense.【重点难点】to know the differences between the simple past tense and the present perfect tense.【预习指导】一、写出下列动词的过去式和过去分词，同时也要熟记。 1、teach _ _ 2、bring _ _ 3、get _ _4、know _ _ 5、grow_ _ 6、find_ _ 7、hold _ _ 8、show_ _ 9、keep_ _ 10、leave_ _ 11、lose_ _ 12、run_ _13、swim_ _ 14、drive_ _ 15、begin _ _二、完成课本p14、15练习。（parta1&parta2）三、尝试着阅读下面的知识链接，看看是否可以理解。【知识链接】 现在完成时的“完成用法”一、现在完成时的结构： 助动词 have / has + 动词的过去分词 ( past participle ) 其中 have / has 为助动词,因而它的否定和疑问句形式全部由 have / has 进行变化。 例如: a. he has already finished his homework. 他已经做完了家庭作业。 否定句：_ ( already 用于肯定句中, 改成否定和疑问句时用 yet ，一般放句末)一般疑问句：_? b. his father has been to beijing three times. 他父亲去过北京三次了。 否定句：_. 一般疑问句：_? 提问：_?二、现在完成时的完成用法 a、定义：现在完成时的完成用法指的是动作发生在过去某一时刻并已结束，但该动作对现在产生了影响，与现在情况具有因果关系。例如：he has turned off the light. 他已把灯关了。 ( 动作结束于过去，但说明的是现在的情况-灯现在不亮了。) b、特点：现在完成时完成用法的特点是动作不延续，因此，该时态只能与表示不定的过去时间状语(如：already，yet，before，recently等)、频度时间状语(如：never，ever，once等)、包括现在时刻在内的时间状语(如：this morning month year.，today等)连用。 例如： have you found your pen yet？ 你已找到你的钢笔了吗？请尝试着做以下的练习 用所给动词的适当形式填空。1. i_ already _ _ (see) the film. i _ (see) it last week. 2. - _ he _(finish) his work today ? -not yet . 3. -_you _(be) to hong kong ? -yes, i _ (be) there twice . 4. -_ you ever _(eat ) chocolate sundaes ? - no, never. 5. my father _ just _ (come) back from work. he is tired now.【学习过程】step1: revisionquestions about reading:(1) how long has mr. chen lived in sunshine town? (he has lived in sunshine town since he moved there with his family when he was two years old.)(2) when did mr. chen get married?(in 1965)(3) there have been many changes in this town. what has the centre of town become?(it has become a park. )(4) how does mr. chen feel from time to time?(he feels a bit lonely)step 2: presentation1. present these two answers:(1)he has lived in sunshine town since he moved there with his family when he was two years old.(2)it has become into a park.2. ask the ss some questions and pay attention to their answers:(1) how long have you lived in this town?(2) how long have you studied in this school?(3) how long have you studied english?(4) what have you studied these days?(5) where have you been recently?3. remind the ss of the differences between the simple past tense and the ppt. and discuss how to form present perfect tense.step 3: present perfect tense1. we use the simple past tense to talk about what happened at a definite time in the past.we use the present perfect tense to talk about things that started in the past and still have some connection with the present.2. how the ppt. formed.(statements,negative statements, ask and answer questions)3.