Miss Emma needed some flour to make a cake.（改成反义疑问句）

Miss Emma needed some flour to make a cake,didn't she?need 作为行为动词（或实义动词）时,有人称、数、和时态的变化,后面可跟名词,代词,不定式,动词ing等,其反义疑问句应借助助动词。本句中needed为过去式,其后是some flour,名词,所以是行为动词的用法,应借助过去时的助动词did来反问。Do you need some more money?要不要再拿上点儿钱?You didn't need to hurry。你没有必要着急。need作为情态动词,没有人称、时态和数的变化,need后直接跟动词原形。反义疑问句直接用need来反问。You need not go。你没必要去。Need I come in early tomorrow?需要我明天一早来吗?明白了吗?