In 1982 , the Securities and Exchange Commission passed a rule allowing companies
to buy back their own stock.
(译文:在1982年,美国证券交易委员会通过了一项规定,允许公司回购自己的股票。)
问:这里的allowing companies to buy back their own stock. 是现在分词短语做同位语对a rule 作进一步解释说明其内容吗?
现在分词不可以作同位语。同位语为名词性结构,分词没有名词性!
allowing为现在分词作定语。a rule allowing...= a rule that/which allows...。
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