八年级英语下册 Unit 1 Past and present Grammar 2教案一 牛津版.doc

8b uint1 grammar 2【教学目标】1.学习现在完成时的时间副词和时间短语。2.能在语境中运用现在完成时。【重点难点】现在完成时与一般过去时在时间副词用法区别。【教学过程】step one: lead-inthe teacher can have a free talk with the students.e.g. you have known something about mr. chen. could you tell me anything about mr. chen? step two: pre-taskrecently we have already known a little about sunshine town. i have never been there before. have you ever been there? s1: no, i havent been there yet.t: mr. chen was born there. he has known it since he was very young. he has known it for a long time. step three: while-tasktask 1: 1) tell the students that we can use adverbs of time with the present perfect tense, such as already, ever, for, just, never, since and yet. 2) some more examples: i have just seen millie on the playground. has millie called yet? no, she hasnt. i have not heard from millie yet. i have done my homework already. i have never read the novel. 3)现在完成时与时间副词(on page16)for +段时间 for two days/three yearssince +点时间 since last night /1992 since two days ago since +句子 since i came here last weekalready 一般用于肯定的陈述句yet 一般用于否定句和疑问句 (否定句中常译为“还”；疑问句中常译为“已经”。)just 刚（注意与just now的区别） recently 近来 ever 曾经(常用于问句) never 从不up to now till now over/in the past 10 years so far before(句尾且不加时间) eg. have you visited our city before?4)exercises a.选择填空 have you done your homework _? (for, just, yet)i have _ _been to chengdu. (ever, never, yet)he has _ washed the dishes. (already, ever, for)he has worked there _ he left school. (already, just, since)have you cleaned your room _? (for, just, yet)she has known sam _ nine years. (for, never, since)have you _ ridden a horse? (ever, for, yet)they have _ arrived. (ever, just, yet)we have not completed the project _. (already, for, yet)b. for or since1. we have lived here _ 1990.2. how long have you studied here? _ 5 years.3. the boy has had a bad cold _ last night.4. mr. huang has kept the books _ a week ago.5. i have taught in the school _ i came here.6. we have been friends _ a long time.总结: for +段时间 since +点时间 (过去时间) since +句子(一般过去时态的句子)c.句型转换 1. the boy has already gone home. (一般疑问句)2. the girl has already given it to me. （否定句）3.they have ever visited the hainan island before .（否定句）总结: 1.(现在完成时）肯定句变为否定句的基本方法：2.（现在完成时）肯定句变为一般疑问句的基本方法：3.注意点：just、already、yet之间的关系及各自适应的句型step four: post-task 完成句子(