be动词

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be动词

be动词一般三种含义：是、在、被。

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He is a teacher. 他是一位老师
He is teaching me. 他正在教我。
He is taught by me. 他被我教。

be动词作系动词

可翻译为“是”。

She is a doctor. 她是一名医生
Those boys are really sad. 那些男孩们是真的伤心。
Not only you but also he is wrong. 不仅你而且他也是错的。
The summer vaction last year was a great experience to me. 去年暑假对我是一次很好的经历。

be动词作助动词构成进行时态

可翻译为“在”。

The world is changing every day. 世界每天在变化。
Tony was reading the book. 托尼正在看书。
Lucy has been playing the piano for a day. 露西已经一直在弹钢琴已经一天了。

be动词作助动词构成被动语态

可翻译为“被”。

Those apples were eaten by my brother. 那些苹果被我弟弟吃掉了。
My computer is often used by my sister. 我的电脑经常被我妹妹使用。
The shoes have not been washed. 这双鞋子还没有被洗。
My mom found that the cake had been eaten. 我妈妈发现蛋糕已经被吃掉了。
The task had been finished before 12:00 yeasterday. 昨天12点之前这个任务已经被完成。
Those children were talking aloud when I entered the room. 当我进入教室这些孩子正在大声讲话。
I'm so tired, because I have been doing my homework for almost 4 hours.