Unit3 The Worldof science Using language-外研版高中英语必修第三册.pptx

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1、Unit 3the world of scienceUsing language 现在完成时现在完成时现在完成时表示过去的动作或存在的状态对现在造成的影响或结果，过去的这个动作或状态也有可能持续下去。用法：1.表示一个动作刚刚结束或完成，但这个动作所造成的状态或影响依然存在，即表示过去的动作对现在的影响或结果，强调现在的情况，常与副词just,already（多用于肯定句或疑问句）,yet（常用于疑问句或否定句句尾）连用。2.表示从过去到现在曾经发生过或经历过某事，表达一种经验或经历，常与副词ever，never，once，twice，before等连用。3.常与for或since连用。For

2、 后面接一段时间；since后接时间点或表示过去时间的时间状语从句。特殊句型特殊句型【This/That/It is the first/second/third time that】【This/That/It is the+形容词最高级形容词最高级+名词名词+从句从句】【It is/has beensince.(过去式过去式)】This is the first time that I _(watch)the play.This is the best film that I _(see).It _(be)six years since I came here.have watchedhav

3、e seenhas been现在完成时练习一1、During the last three decades,the number of people participating in physical fitness programs _(increase)sharply.2、After several years of observation,the research group_ _(arrive)at the conclusion that language acquisition is faster when students are exposed to the situation

4、where it is spoken.3、Simon_(attend)his father for such a long time that he understands almost every gesture of his fathers.4、It is the first time that the local education authority _(make)such strict requirements on going-to-school time for primary and middle school students.5、Over the last few year

5、s,the number of students participating in volunteer programs _(increase)sharply in our school.has increasedhas arrived has attended has made has increased 6、Researchers believe that since 2010 an average of nearly 35,000 elephants _(kill)annually on the continent.7、With the help of high technology,m

6、ore and more new substances _(discover)in the past years.8、In the past few centuries，the lighthouses along North Carolinas coast _(recognize)as signs of safety for travelers at sea.9、I complained to the manager of the hotel about the poor service last week,but up to now，I _(receive)his reply.have be

7、en killed have been discoveredhave been recognizedhavent received10、Large quantities of water,as well as some other timely help including a medical team_(offer)since the serious drought hit Yunnan Province.11、More than one worker _（send）to the training center to improve their working skills in the p

8、ast three years.12、Since 2011,the country _(grow)more corn than rice.13、Regularly eating out seems to _(become)common for many young people in recent years.has been sent has grown have becomehave been offered现在完成时练习二将下面划线句子改为现在完成时被动语态。Within the next 80 years,our lives may be changed beyond recognit

9、ion by 3D printing.It has already affected many things in our lives,right down to the food we eat.For instance,some restaurants in London have served 3D-printed hamburgers to customers.But perhaps the most significant success that people have achieved to date is in medicine.They have made human body

10、 parts,including a beating heart,with 3D printing technology.And it is not just humans who are benefiting-in Brazil,people have given a new 3D-printed shell to a turtle injured in a forest fire!参考答案：1.Many things in our lives have already been affected.2.3D-printed hamburgers have been served to cus

11、tomers in some restaurants in London.3.But perhaps the most significant success that has been achieved to date is in medicine.4.Human body parts,including a beating heart,have been made with 3D printing technology.5.A new 3D-printed shell has been given to a turtle injured in a forest fire!Thanks for your attention