摘要：作主语:动名词表一种抽象的和泛指的概念.而不定式表一次性的.具体的动作. e.g. Swimming is a good exercise. To swim across that river is possible some day when I grow up. 用在It is no use (good, a waste of time, not an easy task )-和there be no -结构中. e.g. It is no good the stable door when the horse is stolen. A. closing B. to shut C. locking D. to lock There is no use him at this hour. A. to call B. called C. to ring D. calling

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