Miss Emma needed some flour to make a cake.(改成反义疑问句)答案为什么不是needn't she?

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Miss Emma needed some flour to make a cake.(改成反义疑问句)答案为什么不是needn't she?
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Miss Emma needed some flour to make a cake.(改成反义疑问句)答案为什么不是needn't she?
Miss Emma needed some flour to make a cake.(改成反义疑问句)答案为什么不是needn't she?

Miss Emma needed some flour to make a cake.(改成反义疑问句)答案为什么不是needn't she?
此处need是实意动词,从needed some flour可以看出.(flour是名词,情态动词后不能加名词.)所以当need作为实意动词时,反义疑问句用do not
当need作为情态动词使用时,如:you needn't go to school today.这里的反义疑问句可以用 need you?
need 以肯定形式出现时,一般做实意动词;以否定形式出现时,一般做情态动词

一楼说的很清楚了,need是实义动词,改反义疑问句要用助动词补上,do 或does 或者变形,情态动词一般不这样用,要用也不是这个语境

因为need在这里是实意动词,所以不用needn't she?

因为need在此句是作为实义动词使用,所以应为didn’t she