几个“w”(what,why,where,when,which)和一个“h”(how)都能引导同位语从句,除此之外两个“是否”也可以引导同位语从句（whether,if）.
所以你的问题是肯定的.如：i don't know the reason why he give me a critical eyes.(我不知道他为什么批评我）
翻译：I can't explain the reason why I learn English.