Section A Grammar-4c Unit10 I’ve had this bike for three years.2009I have taught English since 2009.I have taught English for 9 years.I have taught English since 9 years ago.Present Perfect Tense 现在完成时学习目标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，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 +一时间 eg. for 8 years 2. since +过去的时间点 eg. since 2009 3. since + 一时间+ 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______three hours______three o’clock______two days______yesterday afternoon______I came here______three years ago_______a week_______a long |
