精选优质文档-倾情为你奉上现在完成时一、结构：现在完成时由“助动词have (has) + 过去分词”构成。其否定式是在助动词have/has后加not； 一般疑问句是将助动词have/has移至句首。若肯定句中有already，在变成否定句、疑问句时应将其改成yet。 eg. I have already posted the letter. (信已经不在我这儿了) Her friend has already posted the photos to him. (改为否定句和疑问句) Her friend _ the photos to him _. (hasnt posted, yet)_ her friend _ the photos to him _?(has, posted, yet)二、用法: 1、表示过去发生的某一动作对现在造成的影响或结果,常与一些时间状语,如:already, yet, ever, never, just, befor
