be动词的用法 现在时 I am, you are, he is, we are, you are, they are （缩略式 I\'m, you\'re, he\'s, we\'re, you\'re, they\'re）, （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”是个特别动词；有些语言，如中文和马来文，并没有“be”这样的动词。 “Be”除了原形的“be”之外，还有另外七种形式：am, is, are, been, being, was, were. 在句子中，“be”可以是主动词(The Principal Verb)或助动词(The Auxiliary Verb). 【当主动词时，“be”在性质上属于接系动词(The Linking Verb), 后面要有名词、形容词、地方副词或短语作补足语(The Complement)。例如： 1.The man is a science teacher. 2.Mary\'s new drees are colourful. 3.I have been there before. 4.Mother is in the kitchen now. 【这四个都是陈述句，可以变成疑问句，方法简单，把主语和“be”或助动词对换位置即可： 5.Is the man a science teacher? 6.Are Mary\'s new drees colourful? 7.Have I been there before? 8.Is mother in the kitchen now? 【当“be”要在祈使句中出现时，它必须借重助动词“do”或“don\'t”之助，如： 9.Don\'t be silly! 10.Do be obedient! 11.Don\'t be a fool! 【“Be”有两种缩写法，如下： 12.He\'s not...../He isn\'t.... 13.You\'re not...../You aren\'t... 【但“am + not”的缩写法只有一个： 14.I\'m not. 有人用“ain\'t”, 但这并不是标准英语。 谈过了“be”作主动词的功能，现在看看“be”作助动词时，有些什么用法： 【1.】“Be + 现在分词”以组成进行式时态(Continuous Tenses)，如： 15.Tony\'s maid is washing his new car. 16.The children are playing in the field. 17.Samuel was eating when I came in. 18.We have been living here since 1959. 【2.】“Be + 过去分词”以组成被动语态(The Paive Voice),如： 19.Her money in the drawer was stolen. 20.A number of good jobs are taken up byforeigners. 21.David studied in Taiwan but has been trained as a language lecturer in America 助动词 助动词在有实义动词或叫行为动词的句子中对其进行否定和疑问的时候用，否定句时在其后加not,疑问句时把助动词提到句首，后面用动词原型即可。一般现在时（do/does)、一般过去时（did），一般将来时（will,would/shall,should),现在完成时（have/has),过去完成时（had)等待。而be动词就是在系表结构中用，be直接就是“是”的意思，如果和实义动词一起的话就有be+动词-ing（进行时态）be+动词过去分词（被动语）。
