2020-2021学年八年级下学期英语人教版Unit8一般过去时与现在完成时之比 课件

课题：一般过去时与现在完成时之比 The Simple Present Tense (一般过去时) The Present Perfect Tense(现在完成时) 科目：英语 年级：八年级 I work in this city. I worked in this city last year. They live in Shanghai . They lived in Shanghai last year. 动词过去式的写法： 1、一般情况， 在动词末尾 加ed 2、动词以e（不发音）结尾的，直接在词尾加d 3、I study in Beijing. I studied in Beijing last year . study,copy cry , fly... 4、She stops. She stopped. 辅音加y结尾，变y为i加ed 重读闭音节结尾，双写词尾字母加ed 5、特殊记忆 I go to school by bike every day. I went to school by bike yesterday. 例如：am/is—was come--came grow grew mean meant tell told take took fly flew think thought get got ring rang become became run ran fall fell hear heard buy bought make made eat ate cut cut go went leave left sleep slept shop shopped Have a try 现在完成时结构 e.g. I/He have/has(already) worked here for 20 years. -否: I/He haven't/hasn't worked here for 20 years(yet). -疑: Have/Has you/he worked here for 20 years(yet)? 肯:Yes,I/he have/has. 否:No, I /he haven't/hasn't. 1. 肯定句:主+助动词have (has)+already＋V.过分 2. 否定句：主+haven’t（hasn’t）＋V.过分(yet)? 3. 疑问句：Have/Has ＋主语＋V.过去分词(yet)? 肯定回答：Yes, …have (has). 否定回答：No, …haven’t (hasn’t). 连用时间状语：already, yet, ever, never, just, before, several times 等。 现在完成时的基本句式： 观察 . I saw this film yesterday. 只说明动作发生在过去。 I have seen this film. 强调对现在的影响，电影的内容已经知道了。　 . She returned yesterday. 她是昨天回来的。 She has returned from Paris.她已从巴黎回来了。 . I went there last month.是上个月去的。 I have just been to London. 我刚去过伦敦。 注意：句子中如有一般过去时的时间副词（如 yesterday, last week, in 1960）时，不能使用现在完成时，要用过去时。例如： （ ）Tom has written a letter to his parents last night. （ ）Tom wrote a letter to his parents last night. 错 对 1. How ______(be) Jim’s weekend? It (be not ) bad. 2. A: Have you ______ (see) the robots at the science museum? B: Yes, I ______ (go) there last weekend. 3.I ______(see) him in the library two days ago