精选优质文档-倾情为你奉上新概念英语第一册 语法练习(四)新概念英语第一册学习资料免费下载：新概念英语第一册视频免费下载：新概念英语第一册语法：现在完成时现在完成时构成：主语+助动词have, has+过去分词用法：1) 表示过去发生的和现在有某种联系的动作，常和just, usually, already, since等时间副词连用。I have just had lunch. (饱了，不用再吃了。)He has had a cup of tea.(不渴了，不用再喝。)They have already had their holiday. (不能再度假了。)The boy has already read the book. (已经知道书的内容了，不用再看了。)2) 询问别人是否做过某事一般用现在完成时：Have you finished your homework?Have you been to Beijing?Have he seen the film?
