一般过去时现在完成时和过去完成时知识讲解.docx

一般过去时，现在完成时和过去完成时一般过去时态表示过去某个时间发生的动作或存在的状态，常和表示过去的时间状语连用，也表示过 去经常或反复发生的动作，常和表示频度的时间状语连用，试看下列例句： 一般过去时，现在完成时和过去完成时 I was in the classroom yesterday morning My father was at work last week. I visited the Palace Museum three weeks ago. He always went to work by bus last year. I wrote home once a week at college. 1. 1. yesterday 或以其构成的短语：yesterday morning(afternoon, evening)等； 2. 由last+一时间名词构成的短语：last night, last year (winter, month, week)等； 3. 由时间段+ago构成的短语：a moment ago, a short time ago, an hour ago 等； 4. 其它：just now 或者由句子本身的时态所反映出来的。 现在完成时表示：(1)过去发生或已经完成的动作对现在造成的影响或结果, 常与 already，just，yet， before，ever，never 等副词连用；(2)发生在过去某一时刻的,持续到现在的动作（用行为动词表示）或状态（be 动词表示），常与 for（+时间段），since（+时间点或过去时的句子）连用。试看下列例句： My father has brought many books for me , so I can do some reading now. I have already finished my homework, so I can give it to my teacher now. Kevin hasnt seen the film yet, so he has nothing to say about the film. This is the best film I have ever seen. Mary has been ill for three days. I have lived here since 1998. 现在完成时不能和表示过去的时间状语连用，如 yesterday, last year, two days ago, just now 等等，但可以和 already, yet, sometimes, always, before, recently,ever, never 等连用。 I have met him before. 我从前曾见过他。 Ma Hong has always been a good student. 马红一直是个好学生。 I have often seen him in the street. 我经常在街上看见他。 They have never been to Beijing. 他们从未去过延安。 I havent seen him recently. 我近来没看到他。 现在完成时既然可以表示从过去持续到现在，那么在延续性用法中，谓语动词必须为延续性的， 而不可以和瞬间动词连用。 I have brought the book for ten days. ( × ) They have already come here since three years ago. ( × ) 但是，在否定句中非延续性动词可以表示状态的延续，试看下列例句： I havent seen her for a long time. He hasnt left home ever since he lost his job. 过去完成时表示在过去某一时间或动作之前已经发生或完成了的动作，即“过去的过去”, 常与 by， before 等词连用，也可以表示在过去某个时间或动作之前发生并一直持续到那个时间的动作或状态，常与just，already，for，since 等时间副词连用，试看下列例句： By ten oclock this morning, we had visited the Happy Valley. 过去某一时间I had finished my piano lesson before nine yesterday evening. The film had begun before we got to the cinema. 过去某一时间 He had done his homework be