句1:They have been expecting a splendid crop this year and harvesting has begun earlien than usual. 句2:This last scene shows you what will happen at the end of the harvest:the famous Calabrian macaroni-eating competition.句1中使用了动名词harvesting,句2中使用了名词havest,二者有何区别?
如果一个词既有名词词性又有动词词性,如何选择使用名词形式还是动名词形式?谢谢