1、Lead-in:It has snowed for a whole week.It has been snowing for seven days.I have visited South Africa many times.I have been visiting South Africa this month.Can you tell their differences?Unit 1 Grammar and usagePresentperfecttenseorPresentperfectcontinuoustense?Learning Objectives:a)Review the usa
2、ges of the two tenses learnt last class:Present perfect tense&Present perfect continuous tenseb)Try to understand the basic differences between the two tenses by observing examples.Self-study Instructions:1)Quickly review:What are the basic structures of the two tenses?2)Read point 1 on page 10 and
3、try to think of the differences between these two tenses.Li Jia has read a book about Stonehenge.She finished reading the book.She knows the content of the book now.Guidance and explorationTask 1：Present perfect or present perfect continuous tense?She is still reading the book.Li Jia has been readin
4、g a book about Stonehenge.Conclusion1:We use the present perfect tense to talk about an action completed in the recent past,and the present prefect continuous tense for an action that started in the past and is still happening.现在完成时可以表示事件或动作刚结束；现在完成进行时则强调动作仍在继续。Guidance and explorationTask 2：Observe
5、 the following sentences and try to make a conclusionI have visitedEgypt twice this month.I have been touringEgypt for two months.Conclusion 2:现在完成时可表示反复发生的动作，可与twice 或 how many times等搭配使用。而现在完成进行时则表示持续、不间断的动作，一般用how long提问。How many timeshave you swum in the lake?How long have you been swimming in t
6、he lake?1.I have had this camera for five years.2.I have taken photos of UFOs with this camera.3.I have been taking photos of UFOs with this camera.state verbaction verbaction verbTask 3:A state verb or an action verb?An action means something happening or changing.Some examples of action verbs are
7、do,go,and play.A state means something staying the same.Some examples of state verbs are like,know and exist.Conclusion 3:We can use either a state verb or an action verb with the present perfect tense,but we usually can only use an action verb with the present perfect continuous tense.A state verb
8、doesnt mean an action,so it cant be used in a continuous tense.e.g.:Theyve always had a big garden.I have visited Egypt twice this month.Hes been writing this novel for three years.Ive alreadybeen to Paris.Ive nevervisited Paris.Task 4:never,already,yet,everConclusion 4:We use the present perfect te
9、nse,not the present perfect continuous tense,with the words like always,never,yet,already and ever.How long have you been learning English?How long have you learnt English?Task 5:have learnt have been learning？It has been raining for a long time.It has rained for a long time.Conclusion 5：有些动作开始于过去，现
10、在刚刚结束或仍然在持续，既可以用现在完成时，也可以用现在完成进行时来表达。这样的动词有：do,play,rain,work,expect,hope,learn,lie,live,sleep,sit,stand,study,wait,want,snowSummaryConclusion 1:Conclusion 2:Conclusion 3:Conclusion 4:Conclusion 5:Practice2025/11/102025/11/102）时态填空5.You know,I _(look)for a job for three months,and this is my first formal interview.6.My sister _(stay)in Beijing for three months last year.7.The little boy is dirty all over because he _(play)in the mud all the morning.8.Here he is!We _(wait)anxiously for him since last night.have been lookingstayedhas been playinghave been waiting
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