◆be about to do 表示即将要发生的事
be about to do不能与tomorrow, next week 等表示明确将来时的时间状语连用。
与此用法类似的有：be on the point of doing, 如：He is on the point of breathing his last. 他行将就木。

◆使用被动语态应注意的几个问题
1. 不及物动词无被动语态。
2. 有些动词用主动形式表示被动意义。
This pen writes well.这支笔很好写。
3. 感官动词或使役动词使用省略to的动词不定式，主动语态中不带to ，但变为被动语态时，须加上to。如：
make somebody do something→ somebody＋ be ＋made to do something
see somebody do something→ somebody ＋be ＋seen to do something
4. 如果是接双宾语的动词改为被动语态时，直接宾语(物)作主语，那么动词后要用介词，这个介词由与其搭配的动词决定。如：
He gave me a book.→ A book was given to me by him.
5. 一些动词短语用于被动语态时，动词短语应当看作一个整体，而不能丢掉其中的介词或副词。如：
We can't laugh him. → He can't be laughed by us.
He listens to the radio every day.→ The radio is listened to by him every day.
6. 有些及物动词不能用于被动语态。有些及物动词由于动词的性质(状态动词)、宾语的性质(反身代词或相互代词)以及在某些意义上为不可拆分的固定词组，没有被动语态。
They have a nice house.他们有一所漂亮的房子。
He lacks confidence.他缺少信心。
John could see himself in the mirror.约翰可以在镜子里看到自己。
We could hardly see each other in the fog.在雾中我们很难看清对方。