1、动名词作主语往往表示经常性、习惯性的动作，如painting is his hob水瑞侮瑜by.动名词作主语和不定式作主语一样，也可以用it作形式主语，如it is no use talking without doing
3、英语中有些及物动词只能接Ing形式的龄孢歇唤宾语，这些动词有miss, mind, enjoy, escape, practise, suggest, keep, avoid, escape, appreciate, advise, risk, finish等等
5、need, demand, want, require表示需要，be well worth doing表示值得做， 它们是主动形式表被动含义，如this book is well worth reading
