现在完成时一. 用法：（1）动作发生在过去，强调对现在的影响。与一般过去时的区别：强调过去 一般过去式强调对现在的影响-现在完成时试比较：I have lost my new book. 我把新书丢了。（现在还未找到）I lost my new book yesterday. 我昨天把新书丢了。（昨天丢的，现在找到与否没说明）My mother went to Shanghai.Where is your mother? -She has gone to Shanghai.I didnt have breakfast.I havent have breakfast yet. （2）动作发生在过去某个不确定的时间，但对现在有某种影响和结果。常被just、already、 yet 等副词修饰。如：-Have you had lunch yet? -Yes, I have. Ive just had it.你（已经）吃午饭了吗？ 我刚刚吃过。（现在我不饿了）（3）现在完成时表
