Do you have to buy this hat?No,i needn't necessary为什么填needn't

Do you have to buy this hat?No,i needn't necessary为什么填needn't

needn't 不必=don't have to

need 和necessary是不一样的

你必须买这顶帽子吗？ 不，我不必。没必要
needn't= don't have to
原句应该是No,i needn't. it isn't necessary