摘要：3．作定语时.应根据被修饰词来选用主被动形式. 例如:1).I have a room to paint,so I can’t go out for a picnic with them. 2).We have a room to be painted.Where can we find a worker? (当句中出现了作定语的不定式动词的执行者时用主动式.否则用被动式)

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