现在完成时用法总结.doc

重点语法解析 Pastnow Yesterday , weNow , the classroom cleaned the classroom.is clean because we have cleaned it. 1. My father bought many books for me yesterday . Now , I have a lot to read because ________________________________ 2. I saw this film last week. Now, I know this film because I_____________________. 3. I did my homework yesterday. Now, I can give it to the teacher because I______________Pastnow I began to teachI have taught English at this English at this school fiveschool for five years. years ago. 1. I am a doctor. I began to work when I was 22.Now , I am 26. I ________ for four years. 2. We went to the USA last Monday. Today is Monday . We _________ (stay) in the USA since last Monday. 1、现在完成时：表示过去发生或已经完成的某一动作对现在造成的影响或结果，或从过去开始一直延续到现在的动作或保存的状态，强调的是现在的情况，常用for和since表示一段时间的状语或so far，now，today，this week (month，year)等表示包括现在时间在内的状语。不能和表示过去的时间状语连用（如：in 1990，last Sunday 等）。例如：He has studied English for 5 years.He has studied English since 2001.Now I have finished the work. 注意：表过去某一时间发生的动作或状态一直延续到现在（强调现在），动作或状态一般是延续性的，因此要用表延续性的动词或表状态的动词。表示短暂时间动作的词，如:come，go，die，marry，buy等的完成时不能与for，since等表示一段时间的词连用。也不能用于how long引导的疑问句中。 如不能说：He has borrowed the book for two months.(ⅹ) 但可以说：He has kept the book for 2 months. 或：It has been 2 months since he borrowed the book. 或：Two months has passed since he borrowed the book. 这些瞬间动词常与它对应的可以表示时间段的词语进行互换。 become—beborrow—keepbuy—have begin (start)—be on open—be opendie—be deadleave--be awaycome--be here/in go out—be out join--be a member/be inbegin to study--study 注明：非延续性动词在否定结构中可用于现在完成时态： I haven’t bought anything for two days. 2、现在完成时的结构：have / has + 过去分词否定结构：haven’t / hasn’t + 过去分词 一般疑问句中：Have/Has+主语+动词的过去分词 3、一般过去时：一般过去时只表示过去的动作或状态，和现在不发生关系（即动作或状态在现在已经结束），它可以和表示过去的时间状语连用。 现在完成时与一般过去时的区别： 现在完成时用来表示之前已发生或完成的动作或状态，其结果的确和现在有联系。动作或状态发生在过去，但它的影响现在还存在；而一般过去时表示过去的事实，不表示和现在的关系。　　I have just been to London. I went there last month. 我刚去过伦敦，是上个月去的。　　1. 过去时表示过去某时发生的动作或单纯叙述过去的事情，强调动作；现在完成时为过去发生的，强调过去的事情对现在的影响，强调的是影响。