英语中的现在完成进行时的定义、标志性词及例句都是什么?

英语中的现在完成进行时的定义、标志性词及例句都是什么?
英语中的现在完成进行时的定义、标志性词及例句都是什么?

英语中的现在完成进行时的定义、标志性词及例句都是什么?
现在完成进行时的谓语动词构成 I/ we/ you/ they have been working he/ she/ it has been working （一）表示从过去某时开始一直持续到现在的动作,并且还将持续下去.The Chinese have been making paper for two thousand years.中国有2000年的造纸历史.（动作还将继续下去） I have been learning English since three years ago.自从三年前以来我一直在学英语.（动作还将继续下去） （二）表示在说话时刻之前刚刚结束的动作.We have been waiting for you for half an hour.我们已经等你半个钟头了.（动作不在继续下去） （三）有些现在完成进行时的句子等同于现在完成时的句子.They have been living in this city for ten years.They have lived in this city for ten years.他们在这个城市已经住了10年了.I have been working here for five years.I have worked here for five years.我在这里已经工作两年了.（四）大多数现在完成进行时的句子不等同于现在完成时的句子.I have been writing a book.（动作还将继续下去） 我一直在写一本书.I have written a book.（动作已经完成） 我已经写了一本书.They have been building a bridge.他们一直在造一座桥.They have built a bridge.他们造了一座桥.（五）表示状态的动词不能用于现在完成进行时.I have known him for years.我认识他已经好几年了.* I have been knowing...这类不能用于现在完成进行时的动词还有：love爱,like喜欢,hate讨厌,等.比较过去时与现在完成时 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.2）过去时常与具体的时间状语连用,而现在完成时通常与模糊的时间状语连用,或无时间状语.一般过去时的时间状语:yesterday,last week,…ago,in1980,in October,just now,具体的时间状语 共同的时间状语:this morning,tonight,this April,now,once,before,already,recently,lately 现在完成时的时间状语 for,since,so far,ever,never,just,yet,till / until,up to now,in past years,always,不确定的时间状语 3）现在完成时可表示持续到现在的动作或状态,动词一般是延续性的,如live,teach,learn,work,study,know.过去时常用的非持续性动词有come,go,leave,start,die,finish,become,get married等.举例：I saw this film yesterday.（强调看的动作发生过了.） I have seen this film.（强调对现在的影响,电影的内容已经知道了.） Why did you get up so early?（强调起床的动作已发生过了.） Who hasn't handed in his paper?（强调有卷子,可能为不公平竞争.） She has returned from Paris.她已从巴黎回来了.She returned yesterday.她是昨天回来了.He has been in the League for three years.(在团内的状态可延续) He has been a League member for three years.(是团员的状态可持续) He joined the League three years ago.( 三年前入团,joined为短暂行为.) I have finished my homework now.---Will somebody go and get Dr.White?---He's already been sent for.句子中如有过去时的时间副词（如 yesterday,last,week,in 1960）时,不能使用现在完成时,要用过去时.（错）Tom has written a letter to his parents last night.（对）Tom wrote a letter to his parents last night.