3 助动词be的用法 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. 【查看更多】
