问题标题：
【英语语法Buffaloherds,whichoncethrivedintheGreatPlainsofNorthAmerica,trampledvegetation,1.(therebyaidingfutureplantgrowthbyreturningnutrients)2.(therebyanaidtofutureplantgrowthreturnednutrients)1句是正确的,和2句的】
问题描述：
英语语法
Buffaloherds,whichoncethrivedintheGreatPlainsofNorthAmerica,trampledvegetation,1.(therebyaidingfutureplantgrowthbyreturningnutrients)
2.(therebyanaidtofutureplantgrowthreturnednutrients)
1句是正确的,和2句的区别是啥,为啥1句thereby后面可以直接用aiding,ing形式?）
田金文回答：
thereby后面是现在分词引导的结果状语从句,表示谓语trampledvegetation的后果.分词引导状语从句是很常见的结构呀.第二句显然是错的,如果选第二句的话,括号里面的句子主语是anaid,动词是returned,这样的主谓搭配没...
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