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1、Can you explain the following use of tenses. present simple tense present continuous tense present perfect tense future tense1. All languages _ over a period of time.2. English _ very rapidly.3. How many people _ Chinese?4. I _American English is very different from British English.5. Millions of pe
2、ople _ satellite TV every day.6. The percentage of non-English web pages _.7. What languages _ people _ in China?8. What _ you _this year?change develop speak think watch grow studychangeis developingspeakdont thinkwatchis growingdostudyarestudyingSpecial use of the tensesSpecial use of the tensesTh
3、e Present Simple TenseThe Present Simple Tense: 1)在时间,条件,让步状语从句中,用主将从现;(当if从句出现will时,will是情态动词,表示意愿)Though the work is difficult, we will never give up.2)表示按时间表要发生的动作,此情况常用go,come,leave,open,arrive,startgo,come,leave,open,arrive,start等动词;3)对比赛,图片,剧本,戏剧等的解说、情节介绍;Tom carries the ball to the left.Gramm
4、arGrammarGrammarThe Present Continuous TenseThe Present Continuous Tense: 1)与always,all the time, constantly, always,all the time, constantly, foreverforever等连用,表示说话人责备,厌恶,赞赏等感情,相当于“老是”.Jim is always coming late for class.Hes always thinking of others.2)表示主语最近计划或安排按将要做的事,能这样使用的动词有go,come,leave, go,c
5、ome,leave, arrive, stay, begin,see, meet,startarrive, stay, begin,see, meet,start等;He is meeting the manager tomorrow. TensesThe Future Indefinite TenseThe Future Indefinite Tense: 1)1)will:will:表示说话时决定做的事表示说话时决定做的事; ;表示某种预表示某种预见见; ;有一定的科学根据有一定的科学根据; ;用在用在“I I think/expectthink/expect” 等后的从句中等后的从句中2
6、)2)be going to:be going to:有迹象表明要发生有迹象表明要发生; ;事先计事先计划划, ,考虑考虑, ,安排要做的事安排要做的事. .Jim is going to buy a new coat this winter.Look at the dark clouds, its going to rain3)3)be about to do:be about to do:表示即将发生的动作表示即将发生的动作. . ( (一般不与时间状语连用一般不与时间状语连用, ,但可与但可与whenwhen从句连从句连用用) ) The meeting is about to begi
7、n.4)4)be to do:be to do:表示约定表示约定, ,计划计划, ,安排要做的事安排要做的事. .Were to meet at 4:00 this afternoon.The shop is to be opened in may.TensesThe Present perfect TenseThe Present perfect Tense: 1)1)注意非延续性动词注意非延续性动词, ,不能与时间段连用不能与时间段连用. .He has got married for six years.TensesHe has been married for six years.He
8、 got married six years ago.部分非延续性动词与延续性动词的转换部分非延续性动词与延续性动词的转换: :buyborrowdiecome herearrive at/inmarrybegin/startfinish/endget upgo outJoinleave/movehavekeepbe deadbe herebe at/inbe marriedbe onbe overbe upbe outbe in/be+a+n.be away/out ofActivity 1 on page 4uThe British say Have you got ? while Ame
9、ricans prefer Do you have ?uMany factors have influenced American pronunciation.uSome experts believe that the two varieties are moving closer together.uSome people now believe that British English will disappear.uIn the future, there are going to be many “Englishes”.uLook! The man is filling his au
10、tomobile with gas.an everyday eventpast events which have an effect on the presenta changing situationa possible futurea certain futurean event which is happening now or around nowfor是介词，后跟表示时间段是介词，后跟表示时间段since是介词或连词，后跟表示时间点是介词或连词，后跟表示时间点 uJohn has been in China since two weeks ago. uJohn has been i
11、n China for two weeks.uI have worked hard with my English for all the three senior high years.uI have worked hard with my English since I was in senior high.1.English grammar has not changed much _ the time of Shakespeare.2.The American spelling system has existed _ about 20 years.3.I have been studying English _ I was in primary school.4.We have an American teacher. He has been here _ January.5.CNN has been on the air _ more than twenty years.since和for后跟表时间的短语sinceforsincesincefor Conclusion for 是介词，而since可作介词或连接词； for 后面跟表示时间段的结构 since后面跟表示时间点的结构