【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 man is a science teacher. 这个男子是一位科学教师。 Mary's new dresses are 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. Samuel was eating when I came in. We have been 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 stolen A number of good jobs are taken up by foreigners David studied in Taiwan but hasbeen trained as a language lecturer in America Can all the wonderful birds be found in our Bird Park The disobedient boywas told to stand out- side the classroom Steps are being taken to reduce traffic con- gestion during peak hours Dishonest students will be immediately dealt with