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It has been there for …/since …/as long as
Difficulties（难点）：终止性动词在现在完成时中的正确运用
Teaching steps（教学步骤）
1. Warming-up and revision（课堂热身和复习）
（1）T：What did we learn in the last period?
( 学生根据自己的记忆，回答老师的问题)1
（2）Revision（复习）
T: Let’s first read the sentences in Grammar Focus.
2.PPT展示总结现在完成进行时（注意区别延续性动词与非延续性动词，及其用法）
3.完成相关习题。
4.PPT展示注意非延续性动词与延续性动词的互换。
5.完成相关习题。
6. Work on 4a, 4b
T: Let’s do more exercise about for and since.
(1) Rewrite the sentences using for or since.
To give Ss a worked example, do item 1 together as a class.
（2） Fill in the blanks with the correct forms of the verbs in brackets.
After Ss have finished filling in the blanks, invite a few Ss to read out each item with their answers. Have the rest of the class say if the answers are correct and explain why the answers are correct/incorrect.(老师特别强调for 和since 的用法区别，提示学生要用现在完成时来完成句子。还要注意终止性动词和延续性动词的变化。)
完成4c,练习本单元所学习的重点句型
强化巩固
1)单项选择：
( ) 1. —Excuse me, where is Mr. Brown's office?
—Sorry, I don't know. I _____ here for only a few days.
A. work B. worked
C. have worked D. will work
( ) 2. My grandmother ______ a lot of changes in Tianjin since she came here.
A．sees B. can see
C. will see D. has seen
( ) 3. I _______ many new friends since I came here.
A. make B. made