助动词 be 的用法

1) 用于构成各种时态
* Who is playing the violin? 谁在拉小提琴？
* Yesterday afternoon we were discussing a new plan. 昨天下午我们在讨论一个新的计划。
* Are you going home next week? 你下周回家吗？
* I've been writing letters all this morning. 这个上午我一直在写信。

2) 用于构成各种被动语态
* The road is being repaired. 路正在修整。
* He's not respected by the press. 他们不受报界的尊重。
* Being told the truth, he decided to leave. 得知真相之后，他决定离开。
* The house was built in 1978. 这栋房子建于1978年。
* His money has been stolen. 他的钱被偷了。

3) 用于构成各种被动形式
* I saw him being taken away. 我看见有人把他带走了。
* How to avoid being hit by lightning? 怎么避免被雷击呢？
* They have the misfortune to be hit by a violent storm. 他们不幸遇上了猛烈的风暴。
* A dinner is to be given in honor of the new president. 将为新校长举行宴会。