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学习目标
1.现在完成时的构成；
2.for和 since的用法；
3. 短暂性动词与延续性动词之间的转换。
Present perfect tense
构成:
用法一：
动作发生在过去，对现在有影响。
have/has + 过去分词
用法二：
e.g. Kate has lived here for 3 years.
Kate has lived here since 3 years ago.
Kate has lived here since she came to China.
表示过去某个时间开始的动作或存在的状态，一直持续到现在并可能还将持续下去。动词使用延续性动词，常与for或since引导的时间连用。
思考：句中动词有什么特点？
How long have you stayed at this school?
I have stayed here for two years.
= I have stayed here since two years ago.
since 2016.
时间状语:
1. for +一段时间
eg. for 8 years
2. since +过去的时间点
eg. since 2009
3. since + 一段时间+ ago
eg. since 3 years ago
4. since + 从句（一般过去时态）
eg. since I came here
思考：for 和since用法上有什么不同？
学以致用：用since和for填空