英语中be动词的用法,be动词和助动词的用法区别

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1．be动词可以构成八种时态。Be动词在构成一般现在时，一般过去时，现在进7a64e59b9ee7ad9431333365653830行时，过去进行时，一般将来时，过去将来时，现在完成时和过去完成时，都体现为不同的形式。在句子中表现为：
　　(1)一般现在时：I am...He／She／It is...
　　We／They／You are...
　　例句：You are my best friend.
　　(2)一般过去时 ：I was...He／She／It was...
　　We／They／You were...
　　例句：I was ten years old last year.
　　(3)N在进行时 ：Iam doing...He／She／hisdoing...
　　We／They／You are doing...
　　例句：I am doing my homework now.
　　(4)过去进行时 ：I was doing...He／She／it was doing...
　　We／They／You were doing...
　　例句：You wew going to chool.
　　(5)一般将来时 ：I／He / She／It will be，we will be...
　　I am going to be...
　　He／She／it is going to be...
　　We／They／You are going to be...
　　例句：I am going to go for a rest.
　　(6)过去将来时：I／He／She／It／You／They／We would be...
　　I was goin to be ...
　　He／She／It was going to be ...
　　We/They／You were going to be...
　　例句：They were going to play ball.
　　(7)现在完成时：I have been...
　　He／She／It has been...
　　We／They／You have been...
　　例句：I have been to tell her.
　　(8)过去完成时：I had been...
　　He／She／It had been...
　　We／They／You had been...
　　例句：We had been to finish the job.
　　2、Be动词就是（am，are，is）句子中如果没有实意动词（例如：write，buy）之类的动词，就直接在主语后面加Be动词。而如果是句子中有实意动词，那么如果你要改为一般疑问句，就要借助DO（do也称为助动词），例如：I study.改为一般疑问句：Do you study ?

网友回答

be动词和助动词的用法区别为：意思不同、用法不同、侧重点不同。
　　一、意思不同
　　1、be动词：一般的意思是：是。
　　2、助动词：协助主要动词构成谓语的词叫助动词。
　　二、用法不同
　　1、be动词：he is，we are，you are，they are，（否定缩略式 I'm not，isn't，aren't），过去时 I was，you were，he was，we were，you were，they were （过去时否定缩略式 wasn't，weren't），过去分词been，现在分词being英语的“be”是个特殊动词，有些语言，如马来文等，并没有“be”这样的动词。
　　2、助动词：表示时态，表示语态，构成疑问句，与否636f7079e799bee5baa6e79fa5e9819331333431363037定副词not合用，构成否定句，加强语气，be+现在分词，构成进行时态。be+过去分词，构成被动语态。表示最近、未来的计划或安排。表示命令。表示征求意见。
　　三、侧重点不同
　　1、be动词：be动词有七种形式：be, am, is, are, was, were, been, being。
　　2、助动词：助动词除be可作助动词，do，does，did，will，sha1l，have，hαs，hαd也作助动词。