初中英语语法知识讲解 疑问副词的用法：1.疑问副词是问何时、何地、如何、因何的副词，主要有when, where, how, why。2.疑问副词用在句首。How long have you been staying in America?你在美国待多久了?3.疑问副词在句中引导名词子句。I want to know where she has gone.我想知道她去哪里了。4.疑问副词后接不定词构成的名词片语，在句中可以作主词、受词或主词补语。How to solve the problem g
