有一读者问： 有这样一道填空题：
(1)We can't have that sort of thing _____.
应填happen还是happening?
既可填以不带to的不定式happen，亦可填以现在分词happening。但二者含义稍有区别：前者具有一次性，即只指这一次；后者则具有多次性或重复性，即指经常情况。再试比较：
(2)The magician had the card disappear without lifting a finger. （disappear具有一次性）
(3)The magician had the card disappearing without lifting a finger. （disappearing具有多次性，指不断地消失）
“have+宾语+现在分词”中的现在分词有时则强调其持续性，试比较：
(4)I'll have the car wait at the gate.（wait强调动作，全句意味着：我将派人开车到大门口等）
(5)I'll have the car waiting at the gate.（waiting强调其持续性，全句意味着：我将派人将车开到大门口等着，你随时可用）
