【小编寄语】今天查字典英语网小编教给同学们的是英语中助动词be的用法小结,一起来学习下吧!祝同学们学习进步!
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。
2. be + 过去分词,构成被动语态。如:
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。
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