求解Be动词，人称的变化和过去时态的变化

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e动词在英语语法中，be动词意思和用法很多，一般的意思是：是，此种用法，有多种变化形式，is，am，are，was，were，being，been，to be.另外，be动词还有成为的意思。根据句子中不同的人称、数和时态，应该选择相应的be动词。1意思要看语句的时态:如果是一般过去时,就用was/were如果是一般现在时,就用am/is/are如果是一般将来时,就用will be2用法be （be/is/are/am/was/were)[bi:]vihe 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”是个特殊动词；有些语言，如马来文等，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)3例句对照【当做主动词时，“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：The manis a science teacher.这个男子是一位科学教师。Mary's new dressesare colourful.玛丽的新衣服色彩鲜艳。I havebeen there before.我以前去过那里。My motheris in the kitchen now.我妈妈现在在厨房里。★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：Is the man a science teacher?Are Mary's new dresses colourful?Have I been there before?Is mother in the kitchen now?★当“be”要在祈使句中出现时，陈述句可借助助动词“do”，否定句必须在前加上助动词“don't”，如：Don't be silly!Do be obedient!Be careful!Don'tbe a fool!★“Be”有两种缩写法，如下：He's not...../He isn't....You're not...../You aren't...★但“am + not”的缩写法只有一个：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【1.】“Be + 现在分词”以组成进行式时态(Continuous Tenses)，如：Tony's maidis washing his new car.The children are playing in the field.Samuelwas eating when I came in.We havebeen living here since 1959.【2.】“事/物人 +Be + 过去分词”以组成被动语态(The Passive Voice),如：Her money in the drawer was stolenA number of good jobs are taken up by foreignersDavid studied in Taiwan but hasbeen trained as a language lecturer in AmericaCan all the wonderful birds be found in our Bird ParkThe disobedient boywas told to stand out- side the classroomSteps are being taken to reduce traffic con- gestion during peak hoursDishonest students will be immediately dealt with