精选优质文档-倾情为你奉上现在完成时 1）过去发生或已经完成的动作或存在的状态对现在造成的影响或结果（即它的完成用法）e.g. I have just cleaned the classroom. 2)过去已经开始，一直持续到现在的动作或状态。注意：此时动作可能还要继续。（即它的未完成用法）。 e.g. He has lived in Beijing for ten year-构成方式：have/has+过去分词否定句：在have/has后边加not；一般疑问句：把have/has提前。E.g. I have ridden a horse. I have not ridden a horse. Have you ridden a horse?-
