现代英语中,由 whether 引导的从属句,在句中可作主语、宾语、表语和同位语,也可作状语表让步。本文拟试析 whether/if 引导名词性从句的用法。由 whether/if 引导的名词性从句,可看作间接疑问句或间接选择疑问句。口语中有时省略 whether 或 if。 In modern English, the dependent sentence led by whether can serve as the subject, object, epigraph and appositive in the sentence, and can also make concession. This article intends to analyze whether / if to guide the use of nominal clause. Nominal clause guided by whether / if, can be seen as indirect questions or indirect questions of choice. Sometimes omit whether or if in spoken language.