非谓语动词不定式,动名词,现在分词都有被动式,当它们的逻辑主语是它们所表动作的承受者时使用
如：
His homework(having been） done,he began to watch TV.
His homework(having been done),是独立主格结构作时间状语,由于分词的逻辑主语His homework 是(having been） done所表动作的承受者,所以用分词的被动式
The work is to be done tomorrow.
to be done tomorrow.之所以用被动式,是由于其逻辑主语The work 是它所表动作的承受者
有时也有用主动式表被动的习惯用法,如：
He is to blame.他应该受到责备
The book is worth reading.这本书值得一读.
The flowers require watering.(=The flowers require to be watered) 这花需要浇水了.
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