在英语中什么时候要用be动词（is,am,are）啊? 最好用例句来说明!
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,“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 dresses 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 dresses 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 Passive 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.22.Can all the wonderful birds be found in our Bird Park?23.The disobedient boy was told to stand out- side the classroom.24.Steps are being taken to reduce traffic con- gestion during peak hours.25.Dishonest students will be immediately dealt with.绛旓細be鍔ㄨ瘝鏄嫳璇腑琛ㄧず“鏄”鎴“瀛樺湪”鐨勫姩璇嶏紝鐢ㄤ簬鎻忚堪涓昏鐨勭姸鎬佹垨灞炴с傚畠闅忕潃涓昏鐨勪汉绉板拰鏁扮殑鍙樺寲鑰屽彉鍖栵紝濡傜涓浜虹О鍗曟暟鐢╝m锛岀浜屼汉绉扮敤are锛岀涓変汉绉板崟鏁扮敤is銆傚綋鎴戜滑鎯宠琛ㄨ揪鏌愪釜浜嬬墿鏄粈涔堛佹煇鐗╁瓨鍦ㄤ簬鍝噷鏃讹紝灏变細鐢ㄥ埌be鍔ㄨ瘝銆備簩銆佸叿浣撲娇鐢ㄥ満鏅 1. 鎻忚堪韬唤銆佺姸鎬锛氬綋...
绛旓細涓銆佷綔瀹炰箟鍔ㄨ瘝鐢 1銆佹槸,鎴愪负 濡傦細I am a Chinese.鎴戞槸涓浗浜.He wants to be a doctor.浠栨兂鎴愪负鍖诲笀.2銆佹湁,瀛樺湪 濡傦細There are seven days in a week.涓鏄熸湡鏈変竷澶.To be or not to be---that is the question.鐢熷瓨杩樻槸姣佺伃---閭ｅ氨鏄棶棰樻墍鍦.浜屻佺郴鍔ㄨ瘝 1銆be +鐜板湪鍒嗚瘝,鏋勬垚...
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