例句： Mr. Smith gave up smoking according to his doctor’s advice. Do you feel like having a walk with us in the woods by the sea? Some people in the rich world are opposed to doing business with poor countries. 2．有时在形容词后面也要求用动词＋-ing，例如: busy, worth, worthwhile等。 Is it worthwhile making such an experiment? 3．在point, trouble, difficulty等名词后，应加介词in + 动词-ing。in可以省略。例如： There is not much point (in) thinking about it. American businessmen have difficulty (in) understanding their Japanese counterparts
