许国璋英语1 Lesson22 课件-课件（PPT·精·选）.ppt

Lesson Twenty-Two?知识目标:?Text My Hometown?Dialogue Shopping?Grammar 1. 现在完成时2. 现在完成时和一般过去时的比较?ics 升调小结;并列句的语调MY HOME TOWN?My home town is a beautiful place. It standsbeside a wide river at the foot of low green hills. It has many fine buildings and wide streets. There are trees and flowers everywhere.?But it has not always been like that. In the old days it was a sad, dirty little town. Landlords and merchants lived in the few good houses. For the working people there were only dark, unhealthy rooms in old buildings and huts on narrow muddy streets. Nearly everyone was poor and many had no work.?Everything has changedsince liberation. The people, led by the party, have got rid of the mud and dirt. They have put up schools, theatres, shops and flats. They have an assembly hall and a hospital. Along the river they have built offices, hotels and a big park. Factories with tall chimneys have sprung up. On the river steamers and e and gobusily, day and night. They carry the products of our industries to all parts of the province.?I love my home town, and I love its people. They too have changed. Healthy and happy, they are going all out to build ??一般现在时?一般过去时?现在完成时?现在进行时现在完成时?对于初接触现在完成时的人来说,往往会产生一种茫然,因为它似乎与一般过去时相似。那就是,这两种时态描述的动作都始于过去。其实不然,现在完成时主要表示,发生在过去的动作延续到现在刚刚完成、或许还要延续;侧重于这个动作对现在带来的结果、产生的影响、积累的总和等等。而一般过去时则只不过是表示动作发生在过去的什么时候。弄清了这一区别,就很容易理解现在完成时了。?它主要适用于下面的几种情况:1)表示截止现在业已完成的动作By now, I have collected all the data that I need .到现在为止,我已收集到了我所需的全部资料。She has read 150 pages today .她今天已看了150页。We haven't met for many years .我们已多年没见了。They have developed a new product .他们研制成功了一种新产品。?2)表示发生在过去而对现在产生影响、带来结果的动作Have you had your dinner? 你吃晚饭了吗?She has been to the United States. 她已去美国了。You have grown much 。?3)表示过去发生的动作持续到现在,并可能还要延续It has been five years since he joined the army .?他参军五年了。They have learned English for eight years .?他们已学了八年的英语了。So far we've only discussed the first five 。现在完成时与一般过去时的区别?现在完成时与一般过去时