For example:肯定句为 I went to the playground last weekend. 由肯定句变为一般疑问句,需要在实意动词went前加助动词did,并且助动词提到句首,I由第一人称变为第二人称you,而went由过去式变为一般现在时,即: Did you go to the playground last weekend? 而由一般疑问句变为特殊疑问句是对the playground 的提问,对地点提问用疑问副词where,故go后面不加to,和 go home 是同一个道理,把where提到句首,即变为: Where did you go last weekend?