need表示“需要”或“必须”,通常用于否定句,疑问句,条件句.例如：You needn't do it again．你不需要重复做了.在否定句中,可以用need的否定形式+不定式完成体.例如：We needn't have worried．其实我们不必担心.needn't后的不定式间或也能用进行式或被动语态.例如：1．He needn't be standing in the rain．他不必要站在雨中 其一般疑问句的答语,肯定用must,否定用needn't. Need I go with her?我需要和她一起去吗?
do not need与need not(needn't)有什么不同?分别是在哪些情况下使用?请举例说明
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