精选优质文档-倾情为你奉上现在完成时讲解和习题巩固1. 用法 动作发生在过去，影响到现在。2. 结构have/has+done3. 标志词1）since和for Exercise: 用since和for填空1. Jim has been in Ireland _ Monday. 2. Jill has been in Ireland _ three days.3. His aunt has lived in Australia _5 days. 4. Mary is in her office. She has been there _7 oclock.5. India has been an independent country _1974. *since后接时间点 for后接一段时间2） 表示说话前发生过一次或多次的动作，现在成为一种经验，一般译为汉语“过”，常带有twice, ever, never, three times等时间状语。-Hav
