where did you buy yesterday 为什么buy不用过去式

where did you buy yesterday 为什么buy不用过去式 where did you buy it yesterday哪错了 — Where did you buy where did you buy that What did you buy yesterday morning中,为什么buy后不能加on?急 Where did you buy it?意思? Where did you buy it?话剧 Where did you buy it?的意思 where did you buy these milk where did you buy that hat?怎麼讀 Where did you buy that hat？中文 英语翻译为什么是where did you buy this?而不是where you buy this?为什么要加DI