山东省滕州市大坞镇大坞中学八年级英语下册 Unit 6 How long have you been collecting shells Section A(1a-2c)（第二课时）学案（无答案） 人教新目标版教学目标：1.现在完成进行时的用法及其结构：have(has) been +动词-ing。2学会since与for的用法区别 。教学重点：.现在完成进行时的用法以及与现在进行时和过去进行时的区别。教学步骤 :Step 1 Leading in：Ask one of the students the question: Liu Ziyang, when did you study English ?Help the student answer: I studied English in 2020.Say,in this unit were going to talk about how long weve been doing things .Then ask :Liu Ziyang, how long have you been studying English ?Help him to answer : I have been studying English since 2020./I have been studying English for two years .Get Ss to repeat .Repeat the activity with other students .Step 2 Pre-task：SB Page 44 , 1a .1.Ask a student to read the three questions ,and answer the questions as example like this: I started class at 9:00 .I slept for ten hours . I have been skating for five hours/ I have been skating since five years ago .2.Have Ss work in groups of four .3.Ask the class each question and call on several different students to answer .Step 3 While-task：SB Page 44 , 1b .1.Play the recording and get Ss to fill in the chart .2.Correct the answers . SB Page 44 , 1c .In pairs ,get the students to ask and answer .Then ask some pairs to say their conversations to the class.A:How long has Alison been skating?B:Shes been skating for five hours.A：How long did Sam skate?B:He skated for for hours. SB Page 45 , 2a & 2b .1.Read the instructions and have Ss know what to do .2.Play the recording .Ss write down their answers 3.Correct the answers: . Step 4 Post-task：SB Page 45 , 2c .1.Read the example in sample dialogue in activity 2c .2.In pairs,role play the interview between Alison and the reporter .3.Ask two pairs to say their conversations to the class .A:How long have you been skating? B:Ive been skating since I was seven years old.Step 5 Grammar Focus：SB Page 45 , grammar focus .1.Review the grammar box .2.Explain that in these sentences “since” comes before a date and “for” before a period of time .3.Ask What is the difference between “How long did you skate ?”and “How long have you been skating?” .Explain that “did” question means that the person has stopped doing the action .The “have you been” question shows that the person is continuing to do the action at the present moment .Step6 homework: Finish workbook.教学后记: 通过本课的学习，多数学生都能掌握现在完成进行时的用法及结构，能用此结构来说 一些句子，但是对于since与for 的用法不够明确，有待于进一步练习巩固。