be动词的用法: 1.作实义动词用 1) 是,成为 如: I am a Chinese. 我是中国人. He wants to be a doctor. 他想成为医师. 2) 有,存在 如: There are seven days in a week. 一星期有七天. To be or not to be----that is the question. 生存还是毁灭-----那就是问题所在. 2.系动词 1) be +现在分词,构成进行时态,例如: They are having a meeting.他们正在开会. English is becoming more and more important.英语现在越来越重要. 2) be + 过去分词,构成被动语态,例如: The window was broken by Tom..窗户是汤姆打碎的. English is taught throughout the world.世界各地都教英语. 3) be + 动词不定式,可表示下列内容: a.表示最近、未来的计划或安排,例如: He is to go to New York next week..他下周要去纽约. We are to teach the freshpersons.我们要教新生. 说明:这种用法也可以说成是一种将来时态表达法. b.表示命令,例如: You are to explain this.对此你要做出解释. He is to come to the office this afternoon.要他今天下午来办公室. c.征求意见,例如: How am I to answer him?我该怎样答复他? Who is to go there?谁该去那儿呢? d.表示相约、商定,例如: We are to meet at the school gate at seven tomorrow morning.我们明天早晨7点在校门口集合. |
|