Who wanted to sell the house?want为什么要加ed?

疑问句分为一般疑问句和特殊疑问句.
一般疑问句有助动词do,例如:Did you want to sell the house?这里疑问助词did已经表示句子时态了,所以want用原型.
特殊疑问句有些有助词do有些没有,例如:when do you want to sell the house?这里want用原型,因为有助词do.How did you find the house?这里也一样.Who wanted to sell the house?这句里没有用助词did,所以want要用过去式.
语法多操练就可以了.