约1510字。

　　Unit6 How long have you been collecting shells?
　　The First 教学目标
　　知识技能
　　1. Words:
　　collect, marathon, skate, shell, since, etc.
　　2. Learn the sentence pattern:
　　How long have you been skating?
　　3. Use what they have learned to talt someone s interest, hobbies and continuous time to complete the task.
　　4. Learn the usage of the present perfect tense.
　　Get Students to master the key words and the important sentence patterns by groupwork, pairwork and listening.
　　情感.态度价值观
　　By talking about the interests of the students, develop their interest in life. Through talt a celebrity's interest, encourage students to study hard, inspire students to build up the lofty ideals, and fight for their ambition
　　重点难点
　　1. Learn the sentence pattern:
　　How long have you been skating?
　　2. Learn the usage of the present perfect continuous tense.
　　1. Use knowledge learned before correctly to ask or describe someone's interest, hobbies, etc.
　　2. Fluently use the present perfect progressive tense.
　　教学准备
　　An English textbook, tape recorder and some cards.
　　教学过程
　　Step I  Warm-up
　　T: Good morning, boys and girls.
　　Ss: Good morning, Miss/Mr...
　　T: Today we are going to learn the topic: How long have you been doing sth ?
　　T: Now look at the blackboard. (Draw a long horizontal line across the board) This is called a timeline. It shows the years from past to the present. Let's put some information about ourselves on the timeline.
　　T: When did you start studying English?
　　Si: 2006.
　　T: Si started studying English in 2006. (Write the words "Si  started studying English" above the date 2006 0n the time line. ) So how long have you been studying English? (Point to the date 2006 0n the time line and help the student. )
　　S1 :  Since 2006.
　　T:(Look at the class. )Correct. Si started studying English in 2006. (Point to the starting date and run the finger along the years up to the present year. )He has been studying English for 6 years. Repeat after me, please.  Si started studying English in 2006. He has been studying English for 6 years.
　　Ss: Si started studying English in 2006. He has been studying English for 6 years.
　　Repeat the activity using different dates for several other students. Use a different situation,  such as "When did you start to ride a bicycle?" or "When did you start to babysit?" if these questions are more appropriate. Each time ask the class to repeat a sentence, point to the starting date and run the finger a-long the years up to the present year.
　　Step I  Presentation. Groupwork (la)
　　T: Now let's talt these three questions:
　　How long did you sleep last night?
　　When did you start class today?
　　How long have you been in class today?
　　Write the words at and for on the blackboard.
　　T: You will use the words at and for in sorru answers. For example:  I started class at 7 0'clock. '
　　slept for ten hours. Discuss in groups. Then I'll ask some students to answer them.
　　While students work in groups, move around the room checking their progress and offering help as needed After some time, the teacher stops the students.
　　T: Now I'll ask some groups to show their answers.
　　Choose one student in a group. Ask him or her to answer these questions.
　　Help the students give responses using the words at and for correctly.
　　2. Listening. (lb)T: Now look at the picture on page 44. What can you see in the picture?
　　Sl: I can see a skating marathoru