小学英语语法总结：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?

　　Has he seen the film?

　　3） 表示开始于过去并持续到现在的动作

　　I have lived in Beijing for twenty years.

　　I have worked for this school for 1 year.

　　4） 表示一种经历，经验：去过…地方，做过…事情，经历过…事情

　　I have never had a bath.

　　I have never seen a film.

　　I have never been to cinema.

　　I have ever been to Paris.

　　Have been to表示去过，have gone to 表示去了

　　I have been to London.（人已经回来）

　　He has gone to London.（人还在那里）