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There are some words on the blackboard now.
I have written some words on the blackboard already.
(现在完成时)
1.表示过去发生的动作对现在造成的影响或结果。
wrote some words
on the Bb
The words are on the Bb
Now
Past
I have been a teacher since I left my college(大学).
I became a teacher.
I am still a teacher.
Now
Past
Future
2.表示过去已经开始，持续到现在或将来的动作或状态。
I have been a teacher for 12 years.
3.表示某事直到现在发生了多少次.
I have watched the TV show many times.
I have written some words on the Bb already.
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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