一些动词如need, want, require等作“需要”讲时, 其后的动词-ing形式的主动语态表示被动意义, 也可以用不定式的被动形式来替换。

　　The blackboard needs cleaning. = The blackboard needs to be cleaned.

　　黑板需要擦干净。

　　另外注意be worth及be worthy的用法： The problem is worth discussing.  The problem is worthy of being discussed. The problem is worthy to be discussed.  

　　巩固练习

　　1. When Alice came to, she did not know how long she

　　there. (2011 全国)

　　A.had been lyingB.has been lying

　　C.was lying

　　D.has lain

　　2. Experiments of this kind

　　in both the U.S. and Europe well before the Second World War. (2011 北京)

　　have conducted

　　B. have been conducted

　　C. had conducted

　　D. had been conducted

　　3. On her next birthday, Ann

　　married for twenty years. (2011 天津)

　　A.is B.has been

　　C.will be

　　D.will have been

　　4. A lot of people often forget that oral exams

　　to test our communicative ability. (2011上海)

　　design

　　B. are designed

　　C. are designing

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