精选优质文档-倾情为你奉上 现在完成时一、用法:1. 表示过去发生或已经完成的某一动作对现在造 成的影响或结果。 e.g. Have you had your lunch yet? Yes, I have. Ive just had it.2. 表示动作或状态从过去某一时刻开始，一直延 续到现在，而且可能还要继续下去。 e.g. I havent seen her these days. Ive known Bob for three years. Ive been at this school for over two years. 二、构成： 助动词have / has+动词的过去分词三、句式：1. 肯定句：主语 + have / has + 过去分词(+其他)2.否定句：主语 + have / has + not +过去分词
