人教版六年级上册英语低第四单元学习语法、知识点、考前复习 回答好追加悬赏

如题所述

构成:主语+助动词have, has+过去分词
    用法:
    2) 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)
    3) 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?
    4) 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.
    5) 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)
    6) 表示一种结果, 一般不和时间副词联用
    I have lost my pen.
    I have hurt myself.
    He has become a teacher.
    She has broken my heart.
    句型变化:
    ★变疑问句将助动词移到句首,变否定句在助动词后面加not.
    e.g. Have you lost your pen? I have not lost my pen.
    ★肯定回答及否定回答
    Yes, I have. No, I have not.
    ★特殊疑问句:
    What have you done?
    What has he done?
    一般过去时与现在完成时的区别:
    凡是有明确的表示过去的时间状语的句子为过去时
    注意:有些动词表示的动作有一个终点,不能再延续,因此不能和表示一段时间状语连用
    错:I’ve left Beijing for 3 days.
    对:I left Beijing 3 days ago. I have been away from being for 3 days.
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第1个回答  2012-11-28
主要是单元上的那句话,每天背一篇课文,默写一篇课文。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。本回答被提问者采纳
第2个回答  2012-11-28
主语+助动词have, has+过去分词
    用法:
    2) 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
第3个回答  2012-12-06
这个单元重点是但是第三人称,she,he,it后面动词加s或es。还要注意like后面的动词加ing形式。
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