“是”在古代汉语宾语前置句中出现的频率较高，而它在句中的语法作用却并不相同。专家们各执其说，初学者常常混误。本文探讨了关于宾语前置句中“是”的三个问题：不同“是”作不同的归类；“先君之好是继”中的“是”作助词理解更妥当；如何区别两种不同用法的“是”。 “Yes” appears frequently in the antecedent of the ancient Chinese object, but its grammatical role in the sentence is not the same. Experts say that beginners often mistakes. This article discusses three questions about “yes” in the front sentence of the object: different categories of “yes”; different categories of “yes” Different usage of “yes.”