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现在完成时
Grammar
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。)
I wrote some words on the blackboard just now.
There are some words on the blackboard now.
I have written some words on the blackboard already.
(现在完成时)
Task1.现在完成时的主要用法
(合并为一句)
现在完成时的用法(一)
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
现在完成时的用法(二)
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。