英语语法助动词和情态动词(共40张PPT)

助动词 协助主要动词构成谓语动词词组的词叫助 动词（Auxiliary Verb）。被协助的动词称作主要动词（Main Verb）。 助动词自身没有词义，不可单独使用。如： He doesn't like English.他不喜欢英语。 （doesn't是助动词，无词义；like是主要动词，有词义) 什么是助动词？ 分类及简介 助动词分为：基本助动词，情态助动词，半助动词。 基本助动词：be，do，have 情态助动词：shall, will, should, would，could 半助动词：以be为中心成分，以have为中心成分，以seem为中心成分。 助动词be的用法： 1)be +现在分词，构成进行时态。如： They are having a meeting. English is becoming more and more important. 2)be + 过去分词，构成被动语态。如： The window was broken by Tom. English is taught throughout the world. 3)be + 动词不定式，可表示最近、未来的计划或安排。如：  He is to go to New York next week.  We are to teach the fresh persons. 一、基本助动词 助动词have的用法: 1)have +过去分词，构成完成时态。如： He has left for London. By the end of last month, they had finished half of their work. 2）have + been +现在分词，构成完成进行时。如： I have been studying English for ten years. 3）have + been +过去分词，构成完成式被动语态。如： English has been taught in China for many years. 助动词do 的用法: 1）构成一般疑问句。如： Do you want to pass the CET? 2）do + not 构成否定句。如： He doesn't like to study. In the past, many