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It is difficult to distinguish an "--ing" noun from a present participle (same)eg:-subject of a verb,object of a verb, object of a prepostion:-
eg:-The running man was running up rather than running down.
eg:-He told how hard exercising had been;how his muscles had ached in moving up and moving down.
eg:-Many students are addicted on the" gaming on the phone."
eg:-Computing on the mobile-phone are easily becoming addicted to.
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A present participle clause can be used directly after a noun to indicate something is doing something:-
eg:-He is calling towards the 3 men challenging on ice-bucket challenging.
eg:-The baby was crying after ice-bucket challenging containing ice-cubes.
eg:-The scream of a baby dying in freezing cold is the result of ice-bucket challenging.
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A gerund is a noun formed from a verb which refers to an action,process, or state, where gerunds end in "--ing" are:-eg:-running" and "thinking"
eg:-a man who is running= a running man;
eg:-Thinking, eating, ice-bucket challenging, are pursuit in which we freely indulge .
eg:-Mobile-phone gaming is reckless gaming when you're driving.
eg:-You are the best when boating or window-shopping with your girl-friend.