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Learning aims:
1. Master the structure and basic usage of present perfect tense (PPT).
（掌握现在完成时的用法、基本结构。）
2. Master the rules of forming the past participle of verbs.
（掌握动词的过去分词变化规则。）
3. Master some time expressions usually used in present perfect tense ( PPT).
（掌握常用在现在完成时里的时间表达方式。）
Task1.现在完成时的主要用法
I have written some words on the Bb already.
Task2. 现在完成时结构：
I have been a teacher since I left my college(大学).
Discussion: What new structure can you find in these sentences?
I have been a teacher for 12 years.
I have watched the TV show many times.
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v 过去分词
have / has
+
We make negative statements in
the present perfect tense like this:
I / You/ We / They
opened the door.
He / She / It
have not = haven’t
has not = hasn’t
Task3. 现在完成时否定和一般疑问句。
have