What do they say of it ?请教老师,为什么有of it ? say是及物动词,应该是What do they say.所以,What do they say of it ?该怎么分析成分呢?另外,比较这2句(What do they say of it ? 和 What do they say ?),句意有何差别?
比如The cylinders shall be secured with triangular
wooden chocks to prevent rolling.这句话是不是错误的?应该改成prevent them (from) rolling.或者是把rolling改成名词prevent the roll.