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助动词be的用法 | |||
作者:admin 文章来源:本站原创 点击数: 更新时间:2008/9/25 |
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说明:引用此文请注明出处,并务请保留后面的有效链接地址,谢谢!
1. be +现在分词,构成进行时态。如: They are having a meeting. 他们正在开会。 We were planting trees this time yesterday. 我们昨天这个时候在植树。 The door was broken by Tom. 门是汤姆打破的。 English is taught in our school. 我校教英语。 3. be + 动词不定式,可表示: A. 打算、决定、计划、安排等。如: He is to visit Japan next week. 他决定下周访问日本。 I was to have told you yesterday, but you were not in. 我本打算昨天告诉你的,但你不在家。 B. 指示、命令、禁止等,即“必须,一定”。如: You are to hand in the exercises tomorrow. 你们明天必须交练习。 You’re not to (=You mustn’t) smoke here. 你不可以在此处抽烟。 C. 责任、义务、需要,即“该不该”。如: You are to (=should) report to the police. 你应该报警的。 Am I to go on with the work? 这工作我该不该继续干下去? D. 可能性,与can, may相当,不定式多用被动式。如: The book was not to (=could not) be found. 那本书可能找不到了。 E. 假设,用于虚拟条件句中。如: If it were to rain, we would get wet. 要是下雨,我们就会淋湿。 F. 表示注定要发生或后来必然发生。如: This experience was to change his life. 这次经历注定要改变他的生活。 注:不定式作表语与上述用法是不同的。如: My idea is to go there today. 我的意思是今天就去那里。 引用地址: |
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