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1、 类别例词特点 基本助动动 词词be, do, have无词汇词汇 意义义，只有语语 法作用，协协助主要动动 词词构成时态时态 、语态语态 、 否定句、疑问问句等 助动词动词 短 语语(半助动动 词词)be about to, be due to, be going to, be likely to, be meant to, be supposed to, be willing to, have to, seem to, be unable to, be unwilling to在功能上介于主要动动 词词和助动词动词 之间间的一 类结类结 构其他助动动 词词will, shall, shou
2、ld， would无词义词义 ，主要用来构 成将来时时用法例句 be 现现在分词词，构成进进行 时态时态English is becoming more and more important. They were having a meeting. be 过过去分词词，构成被动动 语态语态English is taught throughout the world. The window was broken by Tom. be 动动 词词不定 式表示最近、未来 的计计划或安排He is to go to New York next week. 表示命令You are to explain
3、this.用法例句have/had 过过去分词词，构成完成时态时态By the end of last month, they had finished half of their work.have been 现现在分词词，构成完成进进行时时I have been studying English for ten years. have been 过过去分词词，构成完成时态时态 的被动语态动语态English has been taught in China for many years.用法例句 构成一般疑问问句Do you want to pass the CET？ donot构成否定句
4、I do not want to be criticized. 构成否定祈使句Dont be so absent minded. 放在动词动词 原形前，加强该该 动词动词 的语语气Do shut up！用于倒装句Little did I know about the city when I was young. 代替实义动词实义动词 以避免重 复She works harder than he does.用法例句will/shall动词动词 原形，构成一般将来时时。I shall study harder at English.He will go to Shanghai.would/should动词动词 原形，构成过过去将来时时。I telephoned him yesterday to ask what I should do next week.
